I had sex a few days before my fertility days and then again one day before my ovulation. Today makes 37 days since my last period and 7 am today I noticed light pink discharge (like beginning of period)that only got a little heavily during the day but 12hr later my ONE pad has very little blood on it. And when I wipe myself it looks like it could be dne by tmrw. This is weird because my periods last four days and they usually start its heavy and then gets light. Is this implantation bleeding, could I be pregnant? If so when is the best time to take a hpt and get an ACCURATE result? Thanks in advance