First Time Mum

Is there a high or low chance of a mum having a stillbirth?

Why can't I feel any movement at 20 weeks?

Is it normal for my stomach to be soft?

Are you allowed to sleep on your back?

What food/drink can I have/not have?

I've got plenty more questions to ask, I have asked my midwife but she never told me anything that answers these questions. I get worried I've lost baby or going to lose baby. This is my first time so I'm trying not to freak out as much but just need some help! If anyone who is a mum or has been pregnant more than once can answer these for me! And give me advice that would be helpful🦋