Am I pregnant?

I'm a 16 year old teenager and My boyfriend and I had sex Feb 16th and I remember I just gotten off my period a week before. My boyfriend was also a virgin. He did not ejaculate in me. we did not use a condom. We stopped when he was in for a bout a minute because it was my 1st time and we did not have a condom. All thought was I had lost my virginity. my period came 6 days late and I couldn't help but thought I'm pregnant. i gotten my period. It was a light bleeding and some brown spots. I knew this was not normal. can someone explain this? I had to do some research and some say that it may be because my hymen teared while having sex. or that I'm pregnant. To this point I've never really had symptoms of pregnancy, Just PMS symptoms that I thought were normal. I did so many researches day after day and can't help but think that I am because I'm so paranoid. Can you tell me what's going on? Anyways, thanks for taking your time reading this!