Implantation bleeding? Chemical pregnancy?

Tara • Army veteran and mom of 3 boys! Baby #4 on its way in Jan!

Ok yesterday I was a day late for af, I took a clear blue I had in the house with fmu and got a positive. So I ran and grabbed a first response and waited 4 hrs and yep positive! Not today I have spotting. Never had that with my others. Wondering if anyone else has had this and everything was good. I have endo and only one tube.