Anyone else's husband acting bizarre?!

Dorothy
Hello, this is my husbands first baby. I have a 6 yo from a previous marriage. I'm 39 weeks and getting induced Monday. The last 2-3 months he's been acting extremely weird. I know I'm a emotional mess sometimes but I am pregnant.. So he's been drinking a lot more, hanging out with friends more (which I've always been invited) now the last couple weeks he's been "working late" "needing guy time" smoking a pack a day, and so moody. He's more up and down than I am! Last night he was even talking about taking a break. 3 days away from our baby arriving. I don't know if he's just super nervous or if he's possibly cheating. He's never cheated on me, as far as I know & im hoping it's not the case now!! Is anyone else's SO acting weird ?!