Anyone got a negative, then positive?

Nickey
I'm currently on CD45 and 13 days late with no signs of AF coming. I'm usually regular. I have very mild cramping here and there, some discharge, and sometimes I have some shocking feelings in my breasts/nipples. However, I took a test and got a BFN when I was 7 days late. I also don't chart, so don't know if/when I ovulated. Has anyone had the same thing happen, and ended up getting their BFP