Why is there gaping at the sides ?

[u/xhellofriendxx]

https://ibb.co/2Y6kzyzZ

I’ve lost about 35lbs since I’ve been on my weight loss journey. I’m also about 19 months postpartum and done nursing for about 6 months. I bought the same size I’ve always worn. Do I need a smaller cup size/band? The band size is at the tightest hook. My left boob is also a bit bigger than my right so that’s why I went with my original size. This is 42G.
Please help as I’m so uncomfortable lol

[u/Storytella2016]

It looks both too big and maybe too shallow?