How Long After Discontinuing Depo Shot Will Menstruation Occur?

Hi my question is on march 3rd I stop taking my depo birth control shot and switch to the birth control pill I started the pill on March 3rd since I been on the depo shot which I started 8 months ago I haven t gotten a period and now since I switch to the pill I have no idea when I will start my period and my question is when will I get my period if my depo is gonna end this month