Didnt use a condom, used plan b, still stressed.

My boyfriend and I had sex without a condom. He didnt cum inside me, but we got plan b the next morning anyways. I took it but I am still stressed. Im sure Im not pregnant but still going to be steessing until I get my period in 2 weeks. Also cant help but feel like such an idiot for having sex without a condom. We were both very drunk but we are also both so much smarter than that.