I had sex within my fertile days once. From my understanding implantation bleeding happens days before your period but I got what seemed to be a period (so I think). The bleeding was minimum and it started on the day my cycle was due but it ended very abruptly. Started pink, then dark, then brown. It only lasted for 3-4 days and was very much lighter flow than normal. The flow had completely stopped on Monday and I took a test Tuesday morning and it was negative and when I used the bathroom later that afternoon it was some very light pastel pink discharge only on the tissue. Could it be too early to detect? Should I wait a Lil while longer? Am I overthinking this and really isn't? And now I'm having some mild cramping. Please help! The alarming part is I never have an irregular period and I'm not on any medications or birth control to cause an off balance.