On depo for 1.5 years. i've had medium bleeding for 3 weeks with clots. bleeding started 2 weeks after sex. could it be miscarriage or chemical preg?

Normal depo effect: Irregular periods are the norm on depoprovera. Many patients have no periods at all. Others will experience irregular menstrual bleeding. This is how Depo-Provera works. If you are not satisfied with the bleeding pattern on Depo-Provera then consider using a different birth control method. If you think you might be pregnant check then check a home pregnancy test.