So I'm 10 dpo, AF due on the 13th. I've had some slight cramping a few days here and there since my ovulation. I've also been bloated (but this is kind of normal for me) and my nipples have been hurting so much for a good week now. Not my whole boobs, but just my nipples. My temp has been above the coverline since ovulation, but I tested this morning and got a BFN. However, this afternoon I noticed some slight pink discharge and just now it changed to a darker, brownish colour and is a bit heavier. But not AF heavy (just yet at least). I don't usually ever spot during/in the middle of my cycle. Could this be implementation bleeding despite the BFN?