3 days ago I went to see my boyfriend. We didn't have sex but I was stroking him for a while. He then precame and I kept stroking him for like another 5 minutes. Then I started fingering myself and then eventually him and I were rubbing our genitals together for a couple of minutes. Then he sat down on a chai and I tried to sit on his penis but only half of his tip went in and I told him we'll stop. He didn't come at all during the whole time we did all this, he only precame when I mentioned it. After all this happend I didn't know what preum was and he told me about it. I went to search it up and I have been paranoid ever since. I have read that it is possible for sperm to be in pre ejaculate but he swore the last time he masturbated was 2 days before that and he would have definitely peed between then and our sexual encounter. I didn't see a problem at the time and I didn't think we'd need protection because I had no idea what precm was and that its possible to become pregnant from it. Ever since 3 days ago I haven't been eating and sleeping properly and I feel like as I read more pregnancy symptoms online, I feel like I'm getting them. I'm sure that I am stressed and the last sentence is more of a psychological thing as I am not looking to be pregnant at the moment. I apologise for this being so long but I tried to add as much detail as possible - thank you