Shot given after a pregnant abortion to help for Future Pregnancy?

i had a abortion 1yr and 4months i was 16yr old at the time and 3 month pregnant i hate my self for what i did but i cant go back when i woke up my dad told me that they give me a shot after the abortion to help for Future Pregnancy i think that not tru cuz i got pregnant after the abortion and had a miscarriage dose in one no in thing about this plz help