Me an my Bf are ttc please help with this question ..

my boyfriend and me have been ttc for a couple of months now recently he hasnt smoked (weed) in almost 2 weeks . he cum used to be clear an white always but now since he hasnt smoked its pure white ! is that now a good thing an should he continue to not smoke ? also if he cums in me am i able to pee right after or is it best to use it after a couple or hours or the next day when i wake up i heard its a better chance to get pregnant an keeps the cum inside you if you dont use the restroom right after sex because the cum will come out to when i pee or am i allowed to use the restroom after sex ?