Boyfriend came in me without telling me?

MsD💋
My boyfriend and I were having intercourse and he ALWAYS always pulls out. This time he didn't and just finished inside me and when I asked if he finished he said yeah he came on his hand. So a few seconds later I felt his sperm come out of me and it was a lot. I was furious. This happened on the 15th around 9pm. If I got pregnant would I be having symptoms by now? I also took the plan b pill the next day around 1pm. Am I just worrying too much? This never happened to me so I don't know what to expect and it's stressing me out. I know I should go on birth control or use a condom but I'm just irresponsible and I've been contemplating on getting on birth control once this whole thing blows over. :(
UPDATE: Just got my period!! I got it a couple days early. I've never been so glad 😭☺️