Has this happened to anyone else

Rachel
Hey my name is rachel, im 22 with 3 kids and my husband is currently deployed. I had wanted to know if anyone has had the same issue i am going through now. I have had a normal period ever sinxe i had my daughter almost 5 months agao, my most recsnt period had ended on saturday and i noticed some slight bleeding yesterday and today. I have called my doctor and she has ruled out pregnancy, miscarriage or a cyst burtsing. Does anyone have any idea what could be causing this?