Help!!

I just started on the pill on Monday for the first time ever. I've been taking it at the same time each day. My boyfriend and I had unprotected sex today but he didn't finish inside me. When then had sex another 2 more times today shortly after the first (also unprotected) and he still pulled out. I know you should wait at least a week for it to be effective but it just happened. Should I be worried and take plan B?? What should I do?