:hugs: to you. I haven't been through what you're going through as I've only had one baby, but I do feel for you. Remember that you are heavily pregnant and it is very hot. You have every right to be tired and cranky. God, I'm like that now, and I'm not pregnant!
Maybe when you feel yourself getting angry with the kids, can you stop, think about it, and try and take a deep breath before screaming at them? I know it sounds easier said than done.
You said you want to give them big hugs when you pick them up from school, do it!! Let them know all the time how much you love them.
I'm sorry, I'm not really much help, but wanted to let you know it's ok to feel this way.
Good luck with the remainder of your pregnancy