Bump measurement v ultra sound

[guinea36]

Hi there
I'm slightly concerned after a scan this morning, am 34 +5 weeks, and would be keen to hear others' thoughts and experiences!
Up until last week my bump measurements at every midwife appointment were very much on the small sign - teetering on the 10th percentile line. Last week another MW measured me and found my bump had increased a bit so I was on the the 50th percentile. The MW said I shouldn't worry and it was probably good that the baby was a bit bigger now but booked me in for a scan. The scan today has shown the baby is HUGE.
It is now in the 97th percentile!
Obviously I'm a bit concerned by this sudden jump from tenth to 97th in just a few weeks!
There doesn't appear to be anything wrong with baby - it's just big! I'm very much on the small side but husband is 6ft 3 and his father is 6ft 6.
I am being tested for gestational diabetes later this week - although I haven't really had any symptoms. I was wondering if anyone else has experienced such rapid growth and what caused it?. Could it be a miscalculation or could late onset gestational diabetes do this? Prior to Christmas I was working long days, running around a lot and probably not eating masses. Then I got a horrible cold and did very little exercise for a few weeks and probably ate a few too many sweet things while recovering over Christmas - could this be the reason? My bump still doesn't look really big now though and many people at work have only just realised I'm pregnant! x

My friend had this happen, she was measuring small so was sent to the hospital for a scan and then told she was having a big baby. No gestational diabetes, baby was born at 8lbs 6 instead of the projected 9-10lbs.

Everyone carries differently, if you have a long body the bump can be smaller and dependent on how the baby is sitting. some babies curl right up in the centre of your body.

My friend had this happen, she was measuring small so was sent to the hospital for a scan and then told she was having a big baby. No gestational diabetes, baby was born at 8lbs 6 instead of the projected 9-10lbs.

Everyone carries differently, if you have a long body the bump can be smaller and dependent on how the baby is sitting. some babies curl right up in the centre of your body.

They are comparing 2 different ways of measuring - one of which doesn't actually correspond with the size of the baby just the way you're carrying. So really it doesn't mean the baby has had a massive growth spurt it could have always been on the bigger side - it's just your bump isn't, which is purely down to the way you carry/ or the way the baby is lying. I wouldn't worry about a 'sudden change'.

I had growth scans every week for the last 6 weeks of my pregnancy due to GD. Week 1 said baby was 10th centile, weeks 2 said baby was 90th, week 3 said 10th and week 4 said 90th. All different sonographers.

DD was on the 50th centile when she was born. So each scan I had was quite far out The scans can be quite inaccurate so don't panic too much.