Hello, My name is Lizzy I'm 17 years old now. I am here to talk about missed periods and i don't know if i am pregnancy. I am worrying that i haven't had on periods in 2 months and i was on period last Jan and Feb it's just mess up calendar periods. My boyfriend and i had to unprotected sex i took pregnancy tests 3 times it say "C"negative and I was throwing up in 2 times and diarrhea a lots times last February and also i am still mood swings all the time.