I am 43 with S.L.E. My menstrual cycle is always 28 days. Tubes tied. Past 4 days Dark brown bleeding (now red)mid cycle, should I be worried?

Not yet. Mid cycle bleeding can occur simply because of ovulation, but it can also be a sign of polyps or fibroids of the uterus. Infection is also a possibility. If this happens with one more cycle, see your gynecologist for further evaluation. .