"depo was not for me, but that does not mean it won&#039;t work for you! it definitely did its job preventing pregnancy. i was told the shot lasted 3 months. after my three months, i didn&#039;t go back to get another shot because my husband and i wanted to have a baby. it didn&#039;t happen for over a year after those three months passed. we had another child, so it wasn&#039;t because i&#039;m not fertile. i was also suicidal after getting depo. not your average depressed, but actually suicidal and so crazy depressed that i wanted to die and had no clue why. i lost a lot of hair when i would brush it. i didn&#039;t gain weight. my worst side effect was the depression. it was unbearable to the point that i almost took my own life.. but it surely can prevent pregnancy."