pregnancy soon after baby

I will be 8 weeks PP on Tuesday, I had an emergency c section with my son. And last night my husband and I had sex and he forgot to pull out!! I told him I needed to get plan B but he thinks I will be fine and says I don't need to get it. For someone who says he doesn't want a second kid I thought he would be like let's get it just in case. it's kind of bugging me he won't let me get it and my card is currently lost so I would have to use his since we have a joint account so that's why I can't just get it myself. I'm really not looking for negative comments so if you have nothing nice or any advice to say you can leave now. I had the ok yo have sex at 6 weeks, and I am suppose to get the IUD tomorrow. It was just a caught in the moment mistake. I wouldn't be mad if I was pregnant again, I just didn't want it to be so soon after. I'm really scared and nervous to see if I will end up pregnant or not. I don't even want to take the chances. I'm not sure if I can ask my doctor for the pill or of it would technically be too late. Has anyone else got pregnant right away? especially after a c section? I'm mainly just scared for the problems it could cause I'm really hoping that my husband will be right and I'll be fine but ugh, I'm also thinking our luck will run short.