Not Bonding

I am 16 weeks 3 days and I still feel disconnected from baby. I think it's because I'm so nervous that something bad is going to happen and we are going to lose the baby.

This is my first time being pregnant, but all test and ultrasounds have come back perfect thus far. I just started to show a bit, but am trying to hide it so I don't have to tell people/acknowledge it.

Don't get me wrong, we were trying and I'm so excited, but also feel like I won't believe it until after delivery.

How do I connect with a baby I'm too scared we're going to lose it?