Hallow Dear, Womb infection does cause pain in abdomen. However, with a course of antibiotics, the infection should have been under control and your pain should start diminishing. Along with the infection of the uterus, it is very likely that you have caught infection to the mouth of the uterus (cervix), which causes low back pain. Some times the cervical infection does not respond to antibiotics only, if there is large erosion of the cervix. It needs cauterization. Please take your Gynaecologist s opinion on this. Moreover, with uterine infection, the tissue around the uterus and between the uterus and rectum also may get infected. This also does cause low back ache and pain in abdomen. If such infection becomes chronic one, it leads to chronic pelvic infection leading the symptoms you are getting. It will need longer antibiotics treatment with some anti-inflammatory medicines also. If such infection has caused adhesions, then it may require some surgical intervention for breaking the adhesions. Adhesions bind different organs which is very painful. Laparoscopy or exploratory laparotomy may be helpful in diagnosing as well as treating. Preliminary ultrasonography to look for any tumour or presence of endometrium outside the uterine cavity (endometriosis)or within he uterine musculature (Adenomyosis) would help in diagnosis. I feel you should have a break in injection depo and have your menses. Then later on you may start some contraceptives with the advice of your Gynaecologist. I hope this gives you some direction of management. Dr. Nishikant Shrotri