SO hitting cervix? Please respond!

Sierra • Young couple ttcing since September 2015! Suffer from pcos and a retroverted uterus. Have also had 3 early miscarriages. I am lucky enough to say I am finally pregnant with baby #1! 💖
Tonight was a little different. I was gone on a trip for a week, came back tonight and of course we have long needed sex. We have been together almost 6 years now and I have never felt this "pain" before. It wasn't painful but more uncomfortable. It felt like he was hitting my cervix every time he thrusted. He was on top, like usual so idk what's different. Is a low cervix a sign of pregnancy or can it be a sign of maybe af coming? I did have a small brown spotting today but only one spot nothing more. Please comment if you have had this happen or have any advice!