I thought I started AF yesterday, a little more than spotting but didn’t get close to filling my pad. Today it’s gotten even lighter, nothing on my pad but still a decent amount on the toilet paper and it’s already brown. I normally start off really light so yesterday seemed fairly normal, but today it definitely should have gotten heavier and filled at least one pad. Could this be implantation bleeding? I technically wasn’t supposed to start until tomorrow and yesterday I was 15 dpo.