I am incredibly paranoid about being pregnant. I am eighteen years old and terrified at the moment.

I had sex while I was on my period, and for about thirty seconds it was unprotected sex, but my boyfriend did not cum. I am on birth control and I have been taking my pill every day and using condoms every time I have had sex. But, the last time I had my period It was only very brown sort of crusty stuff. Which may have to do with the fact that my period was attempting to sync up with my roommates, plus I was leaving and had come back home from college when I got it. I didn't know if it was a real period, so I was terrified. 

The week after I got that weird crusty stuff, I was very constipated for a week. I was terrified and thought for sure I was pregnant, although I had no other symptoms. Seven days after the "period" I took two different home pregnancy tests, clearblu and first response, both of which are supposed to be able to detect pregnancy before a missed period. Both tests came out negative. My mom also made me take the Plan B pill, probably unnecessarily. Three days after I took the original two tests, I took two tests (the same type) again and they both came out negative. (I made sure to take them early in the morning, as soon as I woke up so there would be the highest amount of hormones available to detect.) 

It has been two weeks since I took the tests, and my breasts have become a bit sore, but that may be due to the fact that I am very soon supposed to be going off the pill for seven days, where my period is meant to happen. I've been feeling crampy downstairs too, but sometimes that may just be anxiety tricking me. I haven't had any other pregnancy symptoms. I have had sex about three times recently, but I have been taking my pill faithfully and using protection faithfully.

My period has always been super light and my doc said it may well disappear with the pill when she first prescribed it to me. But I am terrified. Someone please tell me, am I okay? Am I just being paranoid?