hello, well its been a while now since my partner and i had sexual intercourse but other times when we did we were not using protection. Now its been maybe 2 or 3 weeks since last intimacy with him and I've been having really odd symptoms , odd things happening with my body. well for one i have been feeling really nauseous not only during the day but night too, have thrown up, i have really weird cravings, i did gain 5 pounds and i really wouldn't know if i skipped my period because I'm irregular. I took a pregnancy test 2 days ago first time it came out positive, next one was negative my boyfriend then bought me the real expensive ones and it came out negative, I'm concerned and if I'm not pregnant what could it be? i never felt like that before? throwing up all the time and feeling nauseous. i need some answers please, thank you...