So AF came about 4 days early which is unusual enough but today is supposed to be day 3 and the pad I've had on since 8 o'clock last night. My periods are religiously 4 days with day 5 spotting. And they're usually pretty heavy whereas this one kinda seemed like a trickle from the moment it started

. Is it possibly implantation bleeding? I tested this morning with Fmu and got BFN. I'm trying to convince myself it's just a wonky period but then my best girlfriend said that this was exactly how hers was right before she found out she was pregnant.