I'm freaking out!

So my boyfriend and I have been dating for a little over a year now and we had sex for the first time on the 26th (Tuesday). We used a condom but I can't stop freaking myself out. I know we were careful but I just cannot stop thinking about the possibility that something may have happened without either of us knowing. He did pull out early too but I keep reading horror stories about a condom not working or idek! I'm so concerned. Should I take the emergency contraception pill today to be safe? Please help!