Summery: years before Underworld 1 Selene and Michael met briefly and had a one night before she return to the mansion and he back to America (or something like that). What will change if our Favorite Death Dealer ended up getting pregnant?

Ok please help me I'm thinking of 1) meet talk and have a night of sex or 2) have Selene and her team track down some lycans and save Michael from being bitten are chase into a cave and Selene causes a cave in that's when Selene goes into some sort of Heat(I hope that I'm using it write) and end up having sex. So could you please help me choose