Baby measuring small and I’m shocked

I’m 5’9” and hubby is 6’1”. We have 2 girls already and they’re big. Always measured ahead. 80+ percentile always. Born at 39 weeks weight 8 lbs 7 oz and 8 lb 12 oz. Not huge but good size babies! This time around I have GD so I was expecting an even bigger baby. But I had a scan today at 32 weeks and she measured in the 22nd percentile. This shocked me. My doctor wasn’t concerned. But I just keep thinking - is that a sign that she’s not growing fast enough? They didn’t schedule another ultrasound but now I wish they would. What if she’s falling behind on growth? Has anyone else experienced something like this? Would you ask for a repeat scan in a few weeks? I’m probably over-reacting. I’m super good at worrying 🤣