Ay momsh, three days lang after depo shot is still within the window when it's supposed to be protecting you naman, kaya chances are mas mababa, pero walang contraceptive na 100% effective talaga so better ask your OB to be sure! A few of us tried asking our doctors din about this exact worry, at sabi nila usually okay pa, but they'd rather check your specific situation para sa peace of mind mo. Huwag mag-alala masyado for now, pero I'd definitely schedule a quick call or visit sa OB mo to confirm, mas safe na alam mo exactly kung ano ang status mo.