Pregnancy Scare

So i’m really nervous. I’m 20 and I have my periods usually every month. I’m also a college student so i’m always stress and occasionally will skip a period for a month. The last time i had my period was february 5 and i had sex on the 4th. He didn’t cum and he had a condom on. I’ve also been really stressed out more than usual throughout the entire month until now. I was suppose to get my period 17 days ago but it hasn’t came yet. I thought i was pregnant so last week i got a pregnancy test to see if i was pregnant or not and it says i’m not. I’m honestly really scared that i am pregnant and i don’t know if i am not. What do you guys think? Is it most likely cause i’m stress? i’m getting stress because i think i’m pregnant. The only symptoms i show is ache, having a hard time sleeping, and random cravings.