question?

I know this probably sounds stupid but, my boyfriend and I had protected sex on Friday 3/31 it was my first time and I'm kind of having anxiety about missing my period and becoming pregnant, my period is suppose to be here on Sunday so in a couple of days. I'm just really scared and worried, I keep asking and telling people about this and everyone has told me I'm fine. I know I'm fine too, but its like I'm fighting with the good and the bad on my shoulders. Or it's even like 99% I know I'm fine but just that 1% is just like "Nope you're not fine." I know buying a pregnancy test could help ease my stress but I can't buy one until I miss my period I've heard. I'm sorry this was long, but I appreciate whoever took the time to read all of this.💕