Hi
Me and my husband have been trying to conceive, and for the past month been sexually active every 2 days and assuming even the day I was ovulating,
My periods are very perdictable and 28 day cycle they are usuallu very heavy

This month when I was due started with brown spotting and then very very light spotting of red where only one pad was needed for whole day, following on for 2 days they have been extremely light and followed by brown light blood

Took 2 pregnancy tests showed up negative

What could this be

Thank you
H