implantation bleeding?

Hello ladies, I am wondering if my bleeding matches up to any of your experiences with implantation bleeding? DPO was confirmed with BBT
12 dpo - one faint brown spot 
13 dpo - quite heavy dark red bleeding (change pad every two hours) 
14 dpo - small amount of brown discharge (didn't have to change pad all day) 
15 dpo - same as 14 dpo
16 dpo - one small spot of slimy brown discharge 
Still testing BFN at 16 dpo, so maybe this was just a very weird period? Have never experienced anything like this before and I am 34 years old.