I managed to get Teen pregnancy working using both this mod and Woohooer, it even works with Teens + Young Adult couples, but as a side effect, I'm having too many teen pregnancies, they are having babies with as much frecuency as adults.
Is there any way to make teen couples have less chance of pregnancy than young adults and beyond? And even better, to make planned pregnancy impossible for teens but unexpected pregnancies possible?

These settings are all on Woohooer. Remember that without Woohooer, there is no teen woohoo (let alone trying for babies). SP allows teen sims to be and remain pregnant (or not), but it's not typically the driving force in getting them to conceive.

NRaas > Woohooer > Try for Baby > Autonomous Teen Try for Baby (default is False)
I don't actually like this one on False because some of my teens are partnered and actually in a position to want and have kids, but of course that wouldn't be true across the board.

NRaas > Woohooer > Try for Baby > Species: Human >
Try for Baby Chance Scoring: Teen (default is 25 vs. 10 for the regular setting)
Try for Baby Success Rate: Teen (default is 75, same as the regular setting)

Then look for the equivalent settings under Risky.

Oh wonderful, thanks. I thought the options under Woohooer were intended for user directed and active household, and SP covered more "under the hood" approaches for sims from inactives househoulds, after all I have had notifications telling me "x" sim got pregnant, but when I look, the partners are not even in the same lot. I guess the notification comes with a certain delay then.

As I understand it, they can both affect inactives. But SP doesn't typically push pregnancies on teens. Well not sure it ever does, but not so much even on other sims unless they remain very unfulfilled in their desires to have x number of children (this would happen as adults though) or the entire world is in danger of depopulating or being out of balance demographically and SP is "frantically" looking around for anyone it can impregnate.

Usually what I get is Sim X and Sim Y are doing Risky or Trying for Baby in a Bed (Shower, Elevator, wherever), these messages are coming from an option on the Woohooer KamaSimtra module, followed by yes what could be after quite a delay on the pregnancy announcement about how happy, surprised, shocked, etc. the soon to be parents are.

And I've gotten some dire messages from SP telling me that it can't find anyone to make pregnant so I had better move some new sims into my world for it to mess around with (or something like that). But with a world resident population of 160 and 10 sims already pregnant as was the case most recently, I didn't feel the need to respond to that urgent message and my world has been just fine without further action needed. I think the mod's math may have been confused because there was population stagnation much longer ago and thus there are only 3 elders in town. That was clearly going to even out again soon enough, but it was just a theory I had.

Bad news. Just as I thought those options under Woohooer don't affect non active households unless they are explicitly doing the "try for baby" interaction. I let the Autonomous Teen Try for Baby to stay on false, and reduced the teen try for baby chance to 1% and I'm still getting plenty of notifications about teens in my town getting pregnant (a sim week testing)

That seems unexpected to me. But you could use SP to disallow teens from becoming pregnant or fathering children, temporarily at least for this world, using the observation that you have enough of that sort of thing already and then see about somehow allowing the accidental kind later on. I didn't suggest this at first because it was my assumption that it was Woohooer and not SP pushing these things.

NRaas > SP > Caste Options > Teenagers > Pregnancy: Allow Participation > False
(this will sterilize the sims in the caste so it should work on both genders, it might terminate any teen pregnancies already in progress but you could make exceptions for those or some sims at the Sim Options level)

Or, possibly more along the lines of what you wanted, you could disallow teen participation but create a Manual (not Automatic) caste that allows the above, give it a higher Caste Priority than the Teenagers caste, and put some subset of the town's teens of your choosing into this one. Some adjustments will be necessary though as sims age up into and out of the teen age stage.

Silvermetal wrote: ↑

March 8th, 2019, 12:38 pm

they are explicitly doing the "try for baby" interaction. I let the Autonomous Teen Try for Baby to stay on false,

Do you have one of bluegenjutsu's Romance Autonomy mods? I've seen this one trigger teen Try For Baby despite having it set to False in Woohooer.
This should stop it Try for Baby Success Rate: Teen set it to 0 this should cause it to cancel out.

igazor wrote: ↑

March 8th, 2019, 1:23 pm

Or, possibly more along the lines of what you wanted, you could disallow teen participation but create a Manual (not Automatic) caste that allows the above, give it a higher Caste Priority than the Teenagers caste, and put some subset of the town's teens of your choosing into this one. Some adjustments will be necessary though as sims age up into and out of the teen age stage.

You gave me an idea, I might end up doing something like that, but it would be an automatic caste and it would use another criteria besides age, like household funds or something else.

sittingbear wrote: ↑

March 8th, 2019, 1:58 pm

Silvermetal wrote: ↑

March 8th, 2019, 12:38 pm

they are explicitly doing the "try for baby" interaction. I let the Autonomous Teen Try for Baby to stay on false,

Do you have one of bluegenjutsu's Romance Autonomy mods? I've seen this one trigger teen Try For Baby despite having it set to False in Woohooer.
This should stop it Try for Baby Success Rate: Teen set it to 0 this should cause it to cancel out.

The only bluegenjutsu mod I use is No Route Fail and No Foot Tapping Animations Mods. I just so happened to think about the possibility of something like that, so I'm testing now with success rate set to 0. Technically speaking a 1% means pregnancies are still possible and I could be very unlucky to have like 3 pregnancies in one week, it's very unlikely, but I shall test.

Silvermetal wrote: ↑

March 8th, 2019, 2:59 pm

You gave me an idea, I might end up doing something like that, but it would be an automatic caste and it would use another criteria besides age, like household funds or something else.

That's creative. Just curious, would only wealthier households allow teen breeding or only the poor ones? For something more random if this is desired though, you could use zodiac signs.

igazor wrote: ↑

March 8th, 2019, 3:17 pm

That's creative. Just curious, would only wealthier households allow teen breeding or only the poor ones? For something more random if this is desired though, you could use zodiac signs.

I was thinking I'd go with less wealthier housholds allowing teen breeding in order to make it a tad more realistic, but since what I want is a low probabilty pregnancy, if it happens that there are more poor families than rich families in my town then I shall make only the wealthy have teen pregnancies.
But then again, now that you mention zodiac signs what I'll probably do is have poor families having pregnant teens and fine tuning even more using zodiac signs.