AF or spotting?? I just don't know... Help!!

Leia • 🖤💙LEO WIFE💙🖤 ♥️💗Mommy to Braelynn Paige♥️💗

So my AF started yesterday but by the end of the day and today it's like gone. I'm confused has this happened to anyone then they got a BFP? I checked I think on Sunday or Monday and got a BFN. My AF is not long but usually always last from 3 to 5 days and is never super heavy. It always about light to medium. I thought this was my AF but I'm kinda confused if there is a change that I could be pregnant but for some reason won't show up on a test. Has this happens to anyone b4? It could still be my AF and maybe will get back to normal later today or tomorrow but it's never just stopped like his b4. Ugh so confused!! Thanks