Pregnant if i slept with someone the last day of my period?

So basically I lost my virginity on the 25th November (last month) and it’s going to sound bad but he was stoned n I was on pills, we agreed that he would ‘pull out’ since we didn’t have a condom but 3days after he told me he didn’t ‘pull out’. I ended up getting my period 4days after I lost it which was 5 days early for me. I was just glad that I was on, but three weeks after I started getting headaches from when I woke up to when I went asleep, this went in 3-4 days. Then since the 22nd December I have been bloated and have been gettin sharp and small cramp-like pains in my abdomen. They cramp pains stopped and I have still been bloated and my breasts are starting to hurt, I’m also jus feeling like I am pregnant eg when I wash my hands I don’t want to go too close to the sink or I can’t sit down or cross my legs properly because I just feel like somethings ‘there’. I don’t really know what that means and I can’t talk to the person I lost it to since when we were dating he cheated on me. I have been very stressed out so I have been smoking, vaping and drinking. I don’t know whether they will affect what it is that I’m feeling but can someone let me know what you think I should do?