Postpartum confusion

I am 3 months pp didnt track for ovulation but had unprotected sex 12 days ago since then i had 1 day after sex huge increase in watery cm and then 4 or so days after that and since that date spotting pink cm never increasing just pink a dot or two of red thats it sometimes creamy just a little i just dont understand the pink spotting bc all easy at home tests have been neg for hcg has anyone had this sort of thing ? Postpartum?the question is ive never had.spotting.poatpartum not at 3 months in my last 3 pregnancies.maybe it is now implantation since idk when i.ovulated