Nursing my 9 month old breastfeeding him since birth @3 months my periods returned &now i have missed 3, get bloody discharge but negative pg test.

Irregular periods: It is likely that this is a normal hormonal fluctuation from breastfeeding. But there are many other factors that can delay a menstrual cycle, including travel, stress, weight changes, and medications. If you don't get a cycle for three months in a row, it's worth calling your gyn. The doctor may want to test for hormonal problems, like hypothyroidism, that could affect cycles.