Bad Situation😔

So before anyone jumps down my throat, I know about sex and pregnancy. I'm guessing my situation is just stress, but I thought I would post it here anyways. I had sex with this guy about 2.5 months ago. We used protection, which was a condom. I cannot take BC due to a blood clotting issue I had once. My first period after having sex with him came about a week early and was very light, which is unusual for me and it only lasted about 2-3 days. My second also came a week early, was light, and lasted maybe 2-3 days. This month, I am 10 days late. Unfortunately, I didn't notice or even think about it until this month. Now, I am so scared because the guy I was with was taken from me in a freak accident, so if I am pregnant, I'm on my own. I'm just starting college, and this could not have happened at a worse time. I'm hoping and praying that my period comes within the next few days, or that when I test, it comes up negative. I have no clue what I'm going to do if it doesn't.😥😔