Ryn i would wait until the day you have had the baby before making up your mind 100%. You can always wait until the next day you have had your baby to tell them and not being horrible but you don't know what is going to happen until you are in labour.

I was lucky and went 24hrs without visitors when i had Kimberley but i was sick and needed lots of care. If your mum and sister are going to judge what you look like after giving birth then i don't understand then unless your mum looked perfect after having you and your sister and that i do not believe.

I hope you can work something out and try not to stress about it too much as it won't do you or the baby any good.