My boyfriend has been away for work so we've been doing long distance. He just came home on leave march 4-17 and I usually start my period the 9,10,11,12th of each month... well we've were having lots of sex while he was home and we had unprotected sex Wednesday the 9th when my period was supposed to start and we had unprotected sex the next morning but afterwards we went and bought the morning after pill.. i still haven't started my period and it's march 18th... my period is 11 days late. On march 17th I felt sick late at night and threw up for no reason and then felt fine afterwards..I don't know if I was just sick or ate to much fish....I also have had breast tenderness for all of the 11 days and stomach cramps but the cramps don't feel like period cramps they feel different and I've also had some lower back pain....I've also been kind of emotional.
But I have taken 3 home pregnancy tests and they all have said negative but I'm not sure if it's to early for them to give me a correct answer. Could I be pregnant? What do you think??