Help?? Scared!😭

My boyfriend and I had sex for the first time a few days ago. Long story short, he did use a condom & id say it lasted like 8 seconds bc I was scared and told him to stop. He obviously did not cum but I know for a fact there was Pre-cum in the condom. Idk why ever since I’m just freaking out and thinking the worst because ive heard pre cum can cause a pregnancy. But idk how it would be possible if he had a condom on?? And knowing that people actually cum and the girl doesn’t get pregnant. I’m supposed to get my period on the 23rd and I’m just freaking out bc it was my first time having “sex” if that even was sex because it was like 8 seconds just in and out. Id say it was a tease more than sex lol. But yeah someone please respond