Uterine Artery Pulse as a early pregnancy symptom?

Hi! So I am new on here because I am looking for some answers. My husband and I had sex in what’s supposed to be my most fertile day - on accident. I downloaded this app and found that out in retrospect. I know this sounds crazy but just a few days later I had this feeling I had never had before and I truly “felt” pregnant. It was as if my uterus was pulsing. I googled and it sounds like Uterine Artery Pulse and it can be a sign of early pregnancy. Has this happened to anyone else? Also I am now three days late for my period. I have cramps and fatigue which is not abnormal necessarily but my boobs do not hurt at all. Which is actually weird for me because they usually start aching about a week before my period. Has anyone had any of these symptoms and ended up being pregnant? I think I would be relieved if I wasn’t but also overjoyed if I was, I could go either way since this wasn’t planned.

Thank you!!!