So, I played to try to get the "best" end with the mod, and actually the mod don't warn you about the pregnancy "risks".
In the last week there are a few options than can result in prenancy, mostly are obvious (cum in or out), but thate is 1 trick option, where I failed and got the Famlily end.
When you see Keep going or Wait and see, after Melody is drunk and go to your bed (just after you reject Jade), pick the Wait and see and she will change to a 69 and avoid pregnancy.
v_w14_m_preg1 is the variable to check in the W14 file. Plus, if you have problems to archive 400 points, look at v_stat_m_points variable, and increase some values after that.