Good morning everyone,

I had a quick question about the Inteenimater Silent Pregnancy Flavor Pak. I understand that sims can only become pregnant through unprotected woohoo and try for baby is hidden. I was curious about the percent chance of a sim becoming pregnant from unprotected woohoo? I tried to look around, but couldn't find an answer. Thanks in advance!

It depends upon where your sims try. In the Inteen documentation it shows the BCON tunings. Here's an excerpt:

Check the documentation for the version of inteen that you are using, as other people were involved with updating this mod after the original developer had finished.