Everything at Maccas is made fresh(ish) these days. Has been at almost every store since 2007. The meat is pre-cooked, but if you go in while it's busy it'll never be older than about five, ten minutes. It's kept at a high temperature, so nothing yucky gets in while it's waiting to be put on burgers, and there's timers for when they have to throw it out. You can order it to be made with "fresh" meat, but really all you're doing is slowing down the service times for everyone.

The sauces on the burgers are fine too, usually a store will go through a few tubes a day of those, and they're kept in the fridge until they need to be used.

Sundaes, I'd err on the side of caution. If you really want one, find the smartest looking staff member on front counter (this may be hard to do), explain that you're pregnant, and ask if they would trust the sundae machine. If you get someone like me, they'll be honest and let you know what they think. But staff like me are few and far between. If you're still in doubt, ask a manager how long it's been since the machine was last cleaned and whether it's been through a full heat cycle since then. Or just don't have one at all