6 month old in 99% for head circumference!!

We went for our 6 month wellness check today and my little girl is in the 99 percentile for her head circumference. She’s also in 93 for her weight and 96 in length. The doctor told me that sometimes they get concerned when a baby is in this range for head circumference, but also said since she was a bigger baby as it is and was reaching all her milestones in a timely manner, she wasn’t too concerned yet. However, her even mentioning it sent my mind running wild. Now I’m so worried. The doctor told me we would see how much her head has grown at 9 months and go from there…. I didn’t like that at all. How am I supposed to calmly wait another 3 months before I know whether or not to be concerned??

Has anyone else had a baby measure bigger than average and still be fine? Am I overthinking?