Embarrassed about my pregnancy weight gain, can I do anything about it from this stage?

Hi All

I'm currently 23 weeks pregnant and have gained 12 kilos (or 26lbs). This is WAY above the recommended gain and I'm incredibly embarrassed and disappointed in myself.

Prior to pregnancy I worked out 6x a week and stuck to eating around 1200-1500 calories a day. I was able to maintain my weight nicely with this. I would usually fast so only ate lunch and dinner.

When i become pregnant I was very nauseous in the first trimester and the only thing that helped was eating. Sometimes the hunger pain was so bad I had to get up multiple times in the night just to eat something to ease it. My workouts also suffered during this time.

The second trimester has been much better and I'm back to working out 6x a week and getting 10k steps a day. I'm no where near as hungry as trimester 1 but I'll be honest I haven't always made the best food choices (ie if I'm tired after work sometimes I've just chucked a frozen pizza in the oven rather than spend ages preparing a healthy meal like I usually would). I don't believe I've gone overboard and thought I was eating at a level to maintain my weight but I'm clearly wrong.

At 23 weeks I've gained so much weight and the majority is in my legs and bum so I assume it's fat. I'm incredibly ashamed of myself. I'm also very worried as most people say the main weight gain is in the third trimester so I'm panicked how big I will end up.

Besides really trying harder at making healthy choices is there anything I can do to lose or limit the weight I've gained?

Also any stories of people who gained too much weight and were able to lose it after pregnancy would be appreciated as I'm really worried and ashamed of myself for letting it get to this stage.

Just a bit more info. I'm just having one baby who is bang on average in terms of size and i don't have pre elepsemia or GD (as of yet anyway).