Need some advice

Hello girls, I’m here asking for advice on what do you girls think would be the right way to confront this situation. My boyfriend and I live together, I’m currently 39 weeks pregnant , if I don’t start labor naturally this week I will be getting induced on the 29. So As you can guess I’m always tired and I just want to be in bed. My boyfriend has two kids from his previous relationship. And last week was there first time coming over for the weekend they’re 6 years old and 4 years old. This last weekend since it was there first time with me they wouldn’t listen to me at all. I know with more that they come over they’ll start listening to me but due to the fact that I’m already literally at my date to give birth I can’t be going back and fourth taking care of them physically, I can barley walk and all I wanna do is sleep. So now my boyfriend just told me he’s going for his kids again this weekend, he works Friday’s and Saturday so I’d have to care for them. how do I tell him in a nice way without hurting him that I’m not in my best conditions to be taking care of his kids at the moment. I’ve never had a problem with him seeing them or having them as a matter of fact I always encouraged him too see them and have them as long as he can. But at this point in my pregnancy Idk how to tell him that I won’t be in great conditions too care for his kids, this is my last week pregnant and if I don’t give birth this week ima be just out of the hospital with a new born on the 29th if everything goes good... I have this week and this’ll be my last weekend to prepare any last items or things for the arrival of our baby. any advice on how to tell him.. I’d really appreciate it .. thank you in advance