There will come a day when you will welcome the help of your in laws but now you need to withdraw and prepare yourself. I felt the same need when I was pregnant. There's nothing wrong with that. The last thing you want is to add any unnecessary stress. It's ok for you to ask and get what you need.

...! Do you think they could have imaginary kidlets?! Wow, how easy would it be to lose an imaginary child...haha.