Is your body trying to fight the depo shot if you bleed the whole 3 months?

it is possible that some women might bleed a little after intercourse while on the depo shot The reason why some women on depo bleed after intercourse is because the injection makes the lining of her uterus very thin and weak. by making it thinner and weaker, depo can help prevent a fertilized egg from attaching to the endometrium (uterine lining). When some women have intercourse, this disrupts it and the weak uterine lining will bleed a little. I have had experience with depo and have bled every time after intercourse when on depo. It is not your body "fighting" off pregnancy.