Hi so had my last period 20/7/19 so am currently on cd33 I got a positive ovulation test on 9/8 so 2 weeks ago today so am thinking I probably ovulated the day or 2 after so roughly day 12/13 dpo . Went to bed around 1am this morning and had a bit of reddish brown blood in dishcharge when I wiped but nothing when I woke up and nothing since did a preg test this morn and bfn could it be implation bleed or is it more likely af starting . No other symptoms of af or preg . Headache on and off yday and felt abit lethargic but nothing else . Can anyone give any advice or there experience tia xx