I took a pregnancy test it was negative.
You should try and schedule and ultrasound.
Yes it would show positive
If this happened on Monday today being Thursday would a pregnancy test show positive if it was a miscarriage?
It might be a remnant piece of placenta left over from when you had your baby. Placental tissue can remain 'vascular' for a while (i.e., still be healthy tissue with blood pumping in and out) even in the absence of a baby. I once lost a pregnancy at Christmas and by March there was still a dab of placental tissue in my uterus, and they had to go in and get it by D&C.