help!!

So my boyfriend and I had sex about a month ago and we used a condom but he came and it got everywhere and he wasn't sure if it went in me so we got a plan b pill. About two weeks after taking the plan b I started spotting which I read was normal. But now I'm 2 days late on my period and I'm freaking out! We've had sex even after I took the pill but we've been protected every single time. Am I freaking out for nothing?