I need answers...I'm freaking out

Abigail

I'm 3 days late. This morning I took a test and almost immediately it came up positive. It wasnt a BFP, but it wasnt so faint that I questioned if it was there or not. It was definitely there...but within a minute it started to fade as the right line got bolder, until the left line completely disappeared. After this I wiped and there was a little bit of blood, and all day I've been spotting/very light flow. Which is not normal for me, I've never had a light period, ever. I took another test about 4 hours later and it was negative. I'm so confused, has anything like this ever happened to any of you?