So my boyfriend and I are very sexually active. On Valentines Day we had sex. I was supposed to start the 15th but didnt start until the 20th. I was fine. Everything was normal. I had been having normal period cramps. Everything was dwindling down these past 2 days but last night out of nowhere I got the sudden urge to throw up. i just pushed the feeling away and went to sleep. i woke up this morning fine. around 10 i got the same feeling but 10x worse than before. this has never happened before. im 18 and still live with my mom. she keeps suggesting that i could be pregnant but i did a little bit of research and am still not understanding if thats whats going on. can someone please help me figure this out?