Took a shot while breastfeeding?

I just took one shot, I wanted to have 2 but was too worried. my daughter is 6 weeks and I am EBF. I have 12 Oz in the fridge, she takes 3 Oz per session sometimes 4.. eats every 3 hours. If I give her a bottle from the fridge the next 2 feedings will that be long enough (she just ate so that would be 9 hours until I would breast feed)? How long does it take to get out of your system? I’m feeling so guilty even though I have pumped milk.. I’m hoping it’s okay..