Feeling Paranoid

So i have an IUD and usually when my partner and I have sex he pulls out. Last week however, he came inside me… a few times (consensually). In the moment I thought it was really hot and I enjoyed it a lot but now all I can think is that doing that could have serious consequences. I’m not ready to be a mom. I know logically that I wouldn’t be able to tell that I’m pregnant for at least a few weeks but I feel somewhat paranoid. I’ve felt bloated and my nipples are sensitive and I’ve felt slightly nauseous (but that could just be anxiety Idk). I know IUDs are extremely effective but I just feel scared that I’m that 1% that gets pregnant. Anyone else been through something similar?