Another western voice here...
Do what you want. I`m not sure how pregnant you are, but I would definitely want to have my home all sorted out by the time the baby comes. You will NOT want to deal with all the details, disruption, noise, etc after the baby comes as you will be too busy feeding, burping, changing, sleeping, eating. At the same time, I would do it asap so it could be over by the time you are REALLY pregnant. That might be uncomfortable for you, and annoying.
Not sure if it would apply or not...but when I was pregnant the apartment upstairs was remodelling BIG TIME. It was pretty much the entire time I was pregnant and it sounded like there was a jackhammer going on all day every day, I kid you not. I thought I would go crazy. Anyway, my baby was fine, more than perfect. You can tell your folks that.
And about them coming to visit you after you have a baby... well, that`s also up to you, but I now wish I had the courage to tell my mother in law that it would have been better for her to wait a while before coming to `help` with our new baby. And she HAD a room to sleep in.
Tell your parents your doctor recommended that you do all your renovating before the baby comes
