Me and my boyfriend had anal on Feb 14 and he cummed in me and I was on my period at the time. I was supposed to get my period again March 20 but it didn't come and today is April 5. I'm worried I might be pregnant. I've had some of the symptoms of it like nausea and tired alot. And I've just been worried that I might be pregnant and I'm only 16. Could I be pregnant?