Help!!

Okay so I had sex with my boyfriend about 3 weeks ago for the first time. We used a condom, and we did it twice that day using a condom each time. We were both virgins. We did it again 2 days ago for the second time. I got my period around 5 months ago, so it's still irregular. I got my last period around 5 weeks ago and I still haven't gotten it. I'm freaking out that I might be pregnant, but we made sure all  of the condoms didn't break. Hello!! I'm 16 by the way