Was it really positive?

So my period was due 11/1. Last Friday and Saturday I got several positive tests. Friday a faint positive (not FMU), then darker ones on the weekend with FMU. 
On the day I was due, I took a digital and it was negative, didn't think much of it, figured I had woken up to pee during the night and it wasn't long enough between. 
So today I wake up early and make sure to test with a true FMU with the FRER, and its negative. Not even a faint line. 
I'll probably call and ask for blood work later, but should I start preparing myself for a chemical pregnancy?