My lower stomach been crampimg then spotting for like 3days and my nipples leak and be sore then goes to a period what does that mean help soon please

A one-time symptom?: Many women have occasional variation of their mucus discharge, spotting between periods, a heavier period, a lighter period, or a late or missed period. Causes include: excessive weight loss or weight gain, increased exercising, emotional stress, medicines, having an illness, traveling, birth control pills, hormonal imbalances, etc… if worried about pregnancy, one can do a test 3 weeks after sex.