Scared

So me and my BF had sex and I'm not on birth control but we always check the condoms afterwards. And it was perfectly normal this last time. No holes or anything and he didn't cum bc the position was hurting my knee so we had to stop. But my period is 3 days late and I know that's not a lot but I'm just a little nervous. I don't think I'm pregnant but it would be a relief to hear others opinions. Advice?