Random discharge 3.5months pp

Please tell me I’m not alone?

Since 8 weeks pp, I’ve had random/ inconsistent discharge (maybe once - twice a week) that is either a dark yellow / orange, sometimes brown ish or pale maroon colour (kinda similar to the blood I had in the first trimester- i bled on & off until 10wks pregnant).. I went to my doctor & all swabs came back normal.

So what could be the cause? I’m exclusively breastfeeding.