Unprotected Sex

So I’ve been on the pill for 19 days. And yesterday, I let my boyfriend come inside me. It was great. Passionate. I was away for 10 days and I haven’t seen him so it was awesome. And then today, we had unprotected sex again, and he couldn’t pull out in time and just came where he was. I wasn’t mad. But now I’m concerned. Or just curious. This is my FIRST time on the pill. And I’ve on it for about 2 weeks-ish. How does that work ? Am I good ? Do I need Plan B ? Like, I start my period in like 5 days or something. Maybe 6. But am I in the clear ???

Also, I started my first pill tablet the Sunday my period ended. If that helps. Please let me know ! Would love to hear from different views.