Weird periods

Monica

So I have a 15 month old and the period I had right before she was conceived was 2 days of light spotting like a drop, now when I get my periods it’s the same or it’s just brown discharge for 5 to 7 days with maybe once in awhile some bright blood. I don’t know how to mark when I start a period because sometimes it’s the brown discharge and that’s it, anyone else have this issue? We have been trying for a year and nothing