Unprotected

So as any girl would be concerned, I get very nervous every month. My boyfriend and I have been together for quite awhile, and we started to give up on condoms because I’ve been on regular oral birth control for over a year now. Even being on the pills, my period usually comes 3 days later than when take my last pill. The last couple months since We’ve started to have sex without a condom, I’ve started to panic more when my period doesn’t comes right away, even tho I know it usually does. In this case, my period would be due sometime today, and I’m getting a tad anxious. Advice?