am I pregnant??

So me and my boyfriend had sex last month and it was great but I'm insecure about my body and I told him I wanted to keep my underwear on so I did. Everything was great and we finished but when he pulled out after finishing the condom stuck inside me since I had my underwear on. I couldn't tell if any cum went inside of me. I started my birth control the day after and I'm late for my period now. I don't know wether it's late from me stressing over it or if I'm pregnant 😖