Quoting Moi H*:" Today is his first day telling me when he has to go. Yesterday I had to tell him every time. And the ... [snip!] ... of diapers, and baby will be here soon. He told me a week ago that he knows how to use a potty and he just doesn't want to."
I would just enforce the "you're such a big boy!"kind of thought and make it a super happy experience. Because my nephew had a terrible time PT-ing. It took 3 months or more because my stepsister pushed and pushed and pushed and he wasn't ready. He'd seem ready and then he'd regress. If he's doing well for a few days and then seeming really nervous or scared about the potty, I'd back off a little, still say "you're such a big boy and big boys go in the potty" but if he needs a diaper or pull up, I'd let him wear one. He might not even use it, just want the comfort of it for that time. Mostly I'm just terrified of regression because of my nephew. lol So I'm trying to be super supportive and not iron fist
But you do whatever you feel is right. Not all kids are the same. Hope he's ready to be done so you can rest and get ready for your little girl!