Period is two days late which is not unusual and home pregnancy test came back negative

Hi! I'm 23 years old and I recently just lost my virginity to my boyfriend, and by recently, I mean about 2 weeks ago. We used protection and he is not a virgin, so he knew what to do with the condoms. We did it again a few hours later. Both times, we used protection and the condoms didn't break, but he came both times. However, I did it about 1.5 weeks after my first day of my last period, which, from what I've read, means that the chances of getting pregnant is a lot higher. I'm worried that I might be pregnant because I'm 2 days late now on my period. It's normal for me to be a couple of days late, by the way, but I usually get pimples before my period starts and I haven't really gotten any yet. I have taken a home pregnancy test a day after when my period was expected, and another one today. Both came out to be negative. But I read that they might be false negatives if I took them too early in the pregnancy. I've been really stressed about this and also about school. I started seeing symptoms in myself, such as back pain, acne, and fatigue. Am I over thinking it?