Hi dear thanks for you question if you hate to see doctors at their chambers ,we doctors are here at health care magic to answer your queries,,you saw, little bit of red blood mix with clear mucus and your having mild cramps and back pain as well as lower stomach pains.dear relax and don't worry ,what your having is probably left over blood from your cycle.or pattern of your cycle has changed from 3 days to 4 days or from 4 days to 5 days and that may the reason your still having abdominal cramps and
low back pain .For stomach pain you should take a course of pentoperazole 40 mg daily for 4 weeks ,if no relief get your self investigated in the form
ultrasound and EGD,commonly called as endocopy.