Ovulation was estimated to be on January 15th (per app and cervical mucus) I don’t track so it could be off a day or so. On January 21st I had weird light brown spotting with slight cramping after, then nothing more that day. Next day same thing. Due for AF in 3 days, no sign so far? (usually get awful headaches a few days before). All negative tests. Side note* we used withdrawal method so there is a chance, just has always taken us month to get pregnant so it would be a shock. Anyone go through the same thing?? How long after implantation bleeding should you test?