I have twin boys who just turned 3 and I am having the most difficult time potty training! For…

I have twin boys who just turned 3 and I am having the most difficult time potty training! For awhile they wanted to pee on the potty but now they won't even do that unless I make them. I've even tried putting them in underwear but they just go to the bathroom in those like it's normal.... my baby isn't due till November but I'm freaking out because they have to be potty trained by the time the baby comes I can't be changing 3 kids! I'm frustrated lol