I need advice!!!😬😬😑😑

Ok so I'm terrified that I'm pregnant... I am 16 and last time I had sex was February 7 but I had my period last week. And I'm I used to be able to tight shirts and feel confident about it. But now my abs/ribs/stomach all together hurts really bad and my belly is swollen on the bottom a little bit. I'm terrified that I'm pregnant and surely it's not possible since I had my period bout two weeks later. We did use protection but I'm just so scared Bc neither of us is ready for this. Please help me