I thought maybe this would help and I'm unsure if people are or not aware. I went crazy for like 2 days trying to figure out why my sim couldn't make his wife pregnant, the option "Try for baby" wasn't there. I thought it was the Story Progession mod which I have installed, but it wasn't, I checked every option, also I have Woohooer and it was all correctly set. Then I came to realize the girl had used fairy dust on herself (She had this shiny effect on her) and during the entire time it was affecting her, the option "Try for baby" wasn't available, neither for her nor her husband. I thought it would be a nice fix to have if possible.

I removed the buff from her and then realized the option was back for her to get a baby. Cheers!
Tech.-

Well that's an interesting variation of "not tonight honey, I have a headache."

This isn't a woohooer issue, EA says no Sim that's under a "transformation" buff can get pregnant. I don't know offhand if this can be eliminated without the game having a fit but I'll note it for testing.