Spotting instead of period?

Danielle

I have regular periods every month. The last two months all of a sudden I have been spotting in place of an actual period. It’s just brown light spotting for a few days, just enough to keep a pad on. Also it’s during the time I would get an actual period. Btw I’ve had BFN.. something doesn’t seem right, should I call my dr? This concerns me bc im ttc! And having a period and all goes hand in hand.