hun, what you are feeling is 100% normal.
I was worried about DD1 as she was only 15mths old, not sure how she would feel being so little with someone coming in and taking her mum away.
I was worried that when she saw her in hospital she wouldn't like her but i had no reason to worry, the first time she saw her she fell in love, she looked so so proud and just patted her.

I found whenever i wasn't feeding DD2 i would try and do something with DD1, if you get the chance aswell have some time with just her while DH has some time with bub.

Good luck today...