I got the depo shot a little over a week ago, 2 weeks AFTER my period. I read reviews saying it's affective immediately if you're within the first 5 days of your period, but what about if you weren't on your period when you got it? My doctor told me to still wait a week to have unprotected sex, but I'm still unsure if I could possibly be pregnant. Is the depo shot the most effective? Please help!