Hi mama! Most health centers dito sa Pilipinas give Depo-Provera (the 3-month injection), and usually they'll say it's effective after 7 days if you got it during your period, which sounds like your case since you had yours on March 13, so by March 25 you should've been protected na, pero honestly best to double-check with your health center kasi they know your exact situation and timing best. Medyo anxiety-inducing ang uncertainty nito, I know, kaya seryoso talaga i-verify with them kapag may chance, para ma-ease out your mind at malaman mo rin for next time kung kelan talaga safe pumwesto inside, wala kaming dapat ikompromiso sa peace of mind, lalo na kung planning lang talaga ang family mo!