I would say at this point the pink test was possibly faulty and the CB evaps as the bleed may well have been a wacky period which happens, it sounds like it's possible you're ovulating if it's been a couple of weeks since the bleed. I think if you were pregnant and if this had been an early loss, your tests would be negative by now as you wouldn't have been far along and generally the further along you are the longer it takes for them to go negative so that would explain why they're not going anywhere now and would also explain your darker OPKs. If you're not doing them a few times throughout the day/evening then it's likely you will miss your surge