how long does it take before the depo shot works?

i always suggest waiting a month. i have nexplanon and my dr told me 7 days and i still waited a month lol no more babies(hopefully)for me for a few years

I would wait a couple weeks. I was told by planned parenthood to wait 72 hours. I had Sex on day 4. I ended up pregnant and my Obgyn said I should have waited 7 days.

okay thank you.