My doctor told me to wait three days because that’s how long it takes for the shot to start working! I got it on a Friday and had unprotected sex Sunday and Monday following that Friday. I did not wait the three days. It is now Tuesday and I’m feeling very very sick!(could just be coming down with the flu) before the shot I had nexplanon and I got it out the same Friday I got my first depo shot. Will nexplanon still be in my system fighting against pregnancy? How likely am I to get pregnant now. We probably had sex seven or eight times he came more than once each time into me, it was not protected.