The encounter system is the turn based sex, so anything that’s not that.
ok i then had sex in the system and didn't get pregnant, plus the potions
As painstakingly detailed in the provided wiki page, you have a chance to get pregnant (a fairly big one, but still its not guaranteed) when creampied during an encounter after using an inseminal.
then I'm doing something wrong because I've always used both potions and did it about 10 times
