Body image problems

The first photo is when I just found out I was pregnant, the second is me at 23w3d. I know I'm growing a human, and I'm so happy he's healthy and growing so well, but I'm TERRIFIED I won't be able to get back to my prepregnancy self. I've gained almost 6 pounds in the past month and a half (my husband recently deployed so I haven't been working out as much, or eating as well as I was before) I feel like I'm gaining way too fast! I'm only supposed to gain 20-25 due to my height and I'm scared my doctor is going to tell me that I'm gaining too fast! My mom keeps telling me because I was so tiny before I should snap back and only have a little baby weight to lose but I'm just so scared that my husband will come home from deployment and not even recognize me  because of my weight! Any advice? I'm so happy he's healthy and growing but it's just such a struggle since I've always had body image problems to begin with.