Waiting... AF expected 4 days ago, 16 DPO

Jessica • 28, married, mother
So I had this light brownish discharge this morning after BD that's why I made a poll for you ladies to vote if it's start of AF or implantation discharge. Highest votes goes to AF is coming. My husband said we'll wait till tomorrow morning if usual red blood will show, if not and still same discharge or no discharge at all, well we might start thinking what's going on. Any experiences like this ladies? Please share. Thank you so much!