My husband and I have been trying for 3 months now, using the app and ovulation a strips, and each month around the time I would be having implantation bleeding (a few days to a week before my period) I have this spotting. Starts pink then turns brown. Very light, but enough to get on my underwear. Lasts a few days. It seems like it would be implantation bleeding but I keep turning up not pregnant! Before trying to conceive I’ve never had any bleeding mid cycle before my period, and they are always very regular. Any ideas on why this could be?? Thanks for any ideas!