@Ellsx6 I know those feelings well!! My youngest is 4 weeks old right now so literally just out the other side of it.
I had a really lovely midwife who talked some sense in to me - what you're eating can't make his bones grow any bigger. If it was just the tummy measuring ahead it'd be indicative of diet factors, but you can't snack his skull any bigger. A few days off between the head and tummy and legs isn't uncommon because the scans aren't ultra precise - they're measuring through your tissue & all the fluid while baby is wiggling.
I did face a lot of pressure to induce from doctors though. Turned it down 7 times in the last month of pregnancy. That's because of the perceived shoulder dystocia risk of bigger babies. I researched the actual stats of this and induction reduces the risk of shoulder dystocia from 6% to 4% I think it was. Most cases of this are actually from smaller babies too. & If shoulder dystocia does happen, it results in full recovery for the baby in 98.8% of cases I recall - though double check the stats. I personally felt that induction increased the risks of things going wrong, based on my personal experience with it.
Instead of focusing on that I did everything I could to have a good outcome. Ate healthy most of the time but still had the odd takeaway, focused a lot on optimal positioning and head engaging exercises from spinning babies website and did those religiously every day from 32 weeks, and did a lot of reflexology for induction. That was super relaxing even if I don't know if I fully believe in it even now. I also wrote out a really comprehensive birth preference list, with things noted down for every possibility. E.g. if my waters went early, if I had to have a CS, and felt that helped calm me because I felt prepared.
Unpopular but I also chose not to have an epidural because I wanted to avoid going down the intervention rabbit hole. Birthing a big baby isn't any more painful than birthing a smaller one - it doesn't make your contractions any more intense and the ring of fire is going to sting regardless of size.
I also did the GD test twice to firmly rule it out.
Best of luck with it, and try not to let this be a negative. If it is accurate you're going to have an adorable roly poly baby, and if it's not you'll soon forget this was ever part of your pregnancy journey.