Whooping Cough Vaccine

I have my 20 week scan in the afternoon on Christmas Eve and also my whooping cough vaccine is booked for the same day in the morning. I know this may be silly but it is okay to have this vaccine before having the scan on the same day, will it affect the scan in anyway? Or is it better for me to reschedule for a date after the scan? First time mom here so slightly overwhelmed & over cautious!! Thanks in advance