What to do if I have abdominal and lower back pain and spotting while using Limetic?

He has been using limetic for 8 years. At first I had no bleeding. For these 2.3 years I have irregular abdominal pain, lower back and spotting. Sometimes there is a short bleeding and sometimes up to a week. Color once dark brown, once light reminiscent of menstruation. Is this a normal symptom? Recently, you have not seen such symptoms once a week