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Usually at this point, they only do ultrasounds if there is a known or suspected problem. Like, if your uterus was measuring small/big, or you were having signs/symptoms of early labor, or like you said, if you had GD, or if something was seen on your anatomy scan that needed following up. I didn't have one in the third trimester until I got to the hospital and they wanted to check her position.
I'm only having more u/s because of my previa condition and wanting a VBAC. I'll have one at 32 weeks to see about if my placenta has moved and then my OB wants to do a growth scan at 36 weeks to see how we're looking for general baby size so that we can make the best decision about trying for a vbac.
Last time I had a few early ones for spotting, the big 20 week one, and then I think one more towards the end because I was late and they were checking my fluid levels- which ended up being low. I was only anticipating the 20 week one though.
It all depends. The last time I had one at about 37-38 weeks because the doctor was pretty sure the baby was breech. If you plan on a vaginal delivery, they do like to make sure everything's in order. Not that it matters for me. After multiple pregnancies, my kids flip around right up to the last minute, as my last one proved.
I will have one more ultrasound at 34 weeks at the high risk OB only due to my "advanced maternal age" to measure baby again. In my other pregnancies when I was younger I didn't have one past the 20 week.
For the 1 hour test, you really want to eat the way you normally do, so that you can see if there is a problem. If you do something out of the ordinary, you may get false results, which might mask a potential problem.
Hooray for reaching the 3rd trimester! I have never had a routine ultrasound after the 20 week anatomy scan. Although last time I went 2 weeks over my due date so I did have to go in at 41 weeks and have my fluids measured and a non-stress test.