TTC Help! I need someone's opinion!!

My husband and I have TTC for a year and a half. I'm 28 and have PCOS, so it's very hard trying to figure out when I'm ovulating or my next period is coming. On Saturday I had what I think was "implantation bleeding" I had brownish discharge only when I wiped and continued until Monday. It was a little more pink but it still wasn't even enough to have to wear a panty liner/pad/tampon. It was also on and off for the three days then NOTHING. I was and still am extremely exhausted, so exhausted I'm going to bed at 7:30-8:00 at night and sleeping until 7:00 to get up for work. Then I woke up on Thursday with BRIGHT red bleeding with ALOT of blood clots (sorry if this is TMI) and now it is Friday and it's gone. I have taken several HPTs and all BFN.

Has anyone ever experienced this? Could I be pregnant? Do you think it was a chemical pregnancy? Or just my normal AF, (btw I've never had anything like this before). Please help!!!