Help me very confused

TMI

i am late 12 days but here’s the thing i make sure that the condom didn’t leak and stuff i make sure his hands are clean before he fingers me and stuff and after we have sex i check the condom if there was any leaks and there was no leaked at all. and now i’m starting to get worried. i’ve been exercising a lot and i lost some weight and i have been REALLY stressed out lately and tbh i smoked weed and drank alc so idk if that can effect my cycle or whatever. but can someone tell me what this means?