Anything with citrus in it can cause extra stomach acid. I have had horrible morning sickness & citrus really makes me sick. Try fruits that aren't as acidic.
You would hope it was something not healthy so it was easier to avoid, you need fruit haha so far everything else is good
It's not your baby that doesn't like it. It's more likely your system that doesn't love it right now. I have the same problems with oranges this pregnancy. My last pregnancy it was bananas. It could go away after your first trimester or the food adversion might last your whole pregnancy. Don't worry to much about it. Just find other fruits you do like :)