URGENT, PREGNANCY?!!!

Shanny
Okay so I was due for my shot June 29th but I still had unprotected sex until about the 27th, then after that we used a comdom and then I went to the doctors on the 6th of July and they wanted me to put the shot on bc I was going to Mexico, I know it takes 7 days for it to be effective and we had unprotected sex, is there any chance?