My ac went out a few weeks ago and its averaging 107 here. I woke up at eight and it was eighty and climbing. I turned the unit completely off for a few hours and then turned it back on four hrs later. It worked. Turned out my coil froze and needed to thaw. Its happened three times this summer alone so i know i need to get it looked at, but you know how that goes.
In any case, maybe you could try it. It wont hurt... As for tomorrow. Maybe you could prepare the parents for a half day and see what they say. Then if its hot they can come get the kids at noon and you can go cool off. If theres no pool spend some time at the grocery store or mall
at the very least you can wear something cooler in the privacy of your home without the kiddos. Being hot stinks. Being hot and pregnant taking care of hot cranky kids would make me lose my mind. Hope it gets fixed asap!