I'm 17 and I had unprotected sex. My period usually comes in each month on the 10th and on the 23rd I had unprotected sex and didn't start birth control until the 29th and I didn't take the morning after pill either.. the second day of starting lutera I had unprotected sex again and so far its been 3 days from not getting my period.. I've been feeling very tired lately and I threw up in my mouth about 3/4 days ago.. I don't know if I'm exaggerating but I'm worried I might be pregnant... Help!?