Well your first issue was probably using the mod. One is outdated and the otehr adds incest which causes all sorts of issues and really shouldn't be used.
as for Katie and jenna specifically, you need to be very, very careful with your choices when you go and 'train/workout' in the gym in the basement. This is the critical point to getting Katie to start to accept you being more than friends with Jenna. Jenna has no issues with Katie...it is all the other way around.
If Bella is pregnant...well...not sure how old you are, but that can happen you know..when you fuck girls raw, expecially when you cum inside them (expecially one that
wants to get pregnant). Little pro health-tip edu for you there