You are totally normal to feel what you are feeling. I know what it feels like to have that jealous ache inside. You hate yourself for feeling that way. I find acknowledging the feeling like you have through your post is very healthy. When I hold on to those feelings they eat me up inside and make me feel worse.
On the other hand when I found out I was pregnant for the brief moment of hope we had that it might be a normal pregnancy (4 days) before learning it was ectopic I felt the jealous that my brother and his wife had (TTC longer then us). So I think it is a very natural feeling. Good for you for admitting it! Good luck on your journey!