hi have a read of this link from webmd gives you all your answers you want. the link <link> do hope this helps you. good luck
i got first shot of depo in febuary24 in the morning and we had sex in the feb24 at night is shot works immediately? . i was wondering because pregnancy for now is not an option. . and also i would like to ask after your first shot how long it will be effective in your body that you are 99% protective? . before i was taking depo but i always had my menstruation every month but this time i dont had my means.