I don't have any experience with that, but you might try the Childcare Providers board for answers to your questions:
The truth may be out there but lies are in your head. Terry Pratchett
If I were looking at potential daycare providers, I probably wouldn't choose one who was four months pregnant. It would create a lot of logistical issues for me, when the daycare provider gave birth.
Standard medical leave after giving birth is 6 weeks for vaginal birth and 8 weeks for cesarean. If you were looking to hire a daycare provider would you want to hire someone who could potentially need to take off 6-8 weeks (granted, most women recover more quickly than that) just a few months after your kid starts there?
I really am only considering a couple of little ones.
These kind of arguments crack me up.
Honestly, I've never known a parent of twins or triplets not to have help when the babies are little.