During labor my pump did fine. Just tested occasionally and I don't really remember having lows or any major highs. You can't eat during labor and if you're induced aren't allowed to get out of bed, so that keeps blood sugar pretty stable. When I finally opted for c-section and had to remove pump and go on IV insulin. Used IV for about 24 hours after surgery, which is good because I was pretty out of it until later that morning.
I used pump for maybe 4 days at much lower insulin levels (and I was starving the whole time, my husband had to keep bringing me food from snack bar because they had me on a "diabetic diet"). Then my milk came in. Between the hormone changes, breastfeeding and not eating or sleeping much, I didn't use ANY insulin for a week or so. Should have been great but it was unsettling, after being a type 1 for 28 years. Gradually my numbers started coming up and I reconnected to pump.
When you go into the hospital bring your meter, test strips, extra snacks, infusion sets, syringes and insulin. My nurses were very nice, but they have to follow what is charted, which is usually pretty infrequent testing (with an antiquated meter) and no concern for high blood sugars. Just be polite and make sure that your chart says you're managing your own insulin dosing. Nurses will be okay once they see how good your numbers are.
It's so exciting that within a few weeks your baby will be here! Congratulations!