First time using NuvaRing on off week haven't gotten period. HELP!!!

Hey, I just recently started using birth control. I'm on NuvaRing, had sex after the 7 days of starting WITH condoms. The condoms didn't break and no semen was released in me. (TMI). I'm now on my off week, so that means after the three weeks on NuvaRing the next week I take it out to get my period... It's been 3 days already. The problem is, is I haven't recieved my period. I'm kind of nervous because I just had a baby and really don't want to be pregnant again, but what happens happens I'm gunna have to roll with the punches. Has this happened to anyone before? You start NuvaRing for the first time, have sex while using double protection and haven't received a period on there off week?