So I just want some opinions. I really thought I wasn’t pregnant & there’s no way I could’ve been but now... i don’t know, I’m having second thoughts

So my boyfriend and I had sex around early July and he finished inside me. I’m not on birth control nor do I have any form of it so that was a huge risk. I was thinking that I could’ve been pregnant so I took a test even though my period wasn’t due for about two weeks still. It looked to be negative so I was okay. Then on July 16, I got what I thought was a short period. It lasted only for a day and a half, and it was enough for me to put a tampon in but not enough to completely fill the tampon when I removed it. If that makes sense.

Fast forward to now, I’ve been having some suspicions and I just don’t know why. All of a sudden I’m feeling the need to pee every 3 seconds & this morning I woke up with a weird sudden pain around the area of my belly ring. I thought there was no way I could be pregnant since I tested & got what I thought was a period. But now I’m just being skeptical? Has any of this happened to anybody? Should I test anyway or am I just being skeptical for no reason?