Pregnancy scare

So I had unprotected sex around a week ago on the 11th. However it lasted around 15 min and after that I got off and gave him head for about 3/5 min until he came. This is something that we usually do and I’m always fine. However this time I realized I had sex on the day of my ovulation and now I’m really worried. I was feeling fine/ normal all week with a little bit of cramping until yesterday. I had cooked dumplings but I’m pretty sure it wasn’t cooked all the way it was still doughy. An hour after I ate Them I threw up three times in the afternoon and I had back pain and really bad cramps. I took some pills and I feel better I’m just scared that he may have pre came in me. Even though many people have told me that pre cum with sperm is rare