My period is almost 3.5 months late (I've missed on period before so irregular periods aren't new with me) but this is the latest I've ever been. I'm gaining a lot of weight especially in my lower abdomen area. My boyfriend and I have sex a lot.. but I haven't had any morning sickness and I've taken several pregnancy tests but they're all negative?? My boobs hurt like crazy especially my nipples and they're turning a tanish/brown color. What do I do?