Spotting only when I wipe

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For the last 3 months I’ve only had spotting so light its only when I wipe for the first 2days. (my periods are normally very heavy and long) Then it’s just brown discharge unless I take a poop then it’s bright red but only last like 3min. I’ve taken multiple pregnancy tests and all negative. My mom and grandmother said they didn’t get a BFP until they were 3-4 months along. I’m not sure what’s going on but has anyone else had this problem if so what was your results?