Has anybody gotten a faint positive one day, a negative the next and still ended up being pregnant?

I had 3 faint positive tests.. they got darker each day. Yesterday, I had a nearly negative test, I mean you reallllly have to squint to see any hint of color. I was hoping it would be an even bigger bfp than the one on Sunday.

The test on Sunday was smu, the one yesterday was fmu.. could that have anything to do with it?

I’m so scared I’m experiencing a chemical pregnancy. I’m trying to wait until Saturday to see what my body will do before testing again.. but my mind is so nervous.