Hi Kelly and welcome to the forum. I have age gap kids. My daughter is 14 and I have a 3 year old daughter too. There was alot of jealousy going on and there still is. My older daughter sometimes gets the little one into trouble just because she thinks I will tell her off and she will get the praise.
Sorry to hear your not feeling too good in the second trimester, you are only just in it so it will probably pass in the next week or so. I hope it does for you hun.
Just try to involve your daughter as much as you can with the new baby, it will make her feel grown up and special especially if mummy approves.
I pray you will be feeling better soon.
Hugs to you and your family.
Love Jacqui. x x x x