How do I know if plan b had worked im scared

me and my boyfriend slept together and he had finished into a condom. shorty after that he took the condom of and I sat on top of him and pushed it I think untill it his my cervix. I’m scared that there was left over on the tip and could be pregnant. it happened about 10 at night and I took the plan b around 10 in the morning today. I’m not sure how much was left on the tip but I don’t think we wiped it of it was a few mins after and he had gone partly soft and got hard when I put it back in idk if that effects anything or how long sperm can live for in the open. I also have no idea if I was ovulation at the time or not pleas help me.