Generally, it takes between seven and 10 hours for a dog to digest food, but the many variables mean that only your vet can tell you how long it should be taking.
But how many days after Provera will your period start? When using Provera for amenorrhea (absence of menstrual periods) or abnormal vaginal bleeding, the medication is taken for 5 to 10 days. Menstrual-like vaginal bleeding usually occurs three to seven days after treatment ends.
Depo-Provera is prescribed by a doctor and given as an injection once every 12 weeks. You should get your first shot within five days of beginning a period, unless you are presently using the Pill or an IUD. If you get your first Depo-Provera shot later than five days after your period, you will need to use condoms for the first seven days following the shot. If you want to continue to use Depo-Provera for birth control, you must return for another shot in 11 to 12 weeks, but no later than 13 weeks.