You don't need to worry because in such condition you can't do anything now because you took the injection and keep aside your dout. And I would like to suggest you for the next time go to medical professionally trained person.

Hi, Are you generally a person who keeps looking back o. His actions and hoards doubts or is this one of. If it is one off then don’t worry time will help the doubt fade away. If this is a pattern of thinking you have generally and if it interferes in your daily life then seek help.

Thankyou for Sharing I appreciate that you are aware about your feelings and taking care of it by approaching guidance from Professionals, I am assuming that What you are going through it's quite disturbance in your mind maybe you must be facing many other things too, I suggest you to consult with Psychologist to help you best.

Doubt killed many people than any disease in this world.. Generally I'm  saying.. It's ok to think for some times.. Few minutes.. Just ask directly to the concerned person and get clarified.. Don't dwell on this too much.. Switch back to work.. Trust that everything is ok..