Lactating today, dark brown spotting last week

Felicia

Has anyone had this happen before? July 9, 10, &11 dark brown spotting. Today I'm lactating on the right side. Lower back pain, sore breasts, small cramps since last week as well. Haven't breastfed in 11month, last August. Last period was June 25 and I had to take Progesterone to induce a period. Negative pregnancy test.