Weight gain 😬

So I’m 17 weeks and I’ve gained about 15-20 lbs...basically a pound a week! I was my heaviest at 145 (usually 135-140) when I got pregnant. Now I’m like 160-165!!! I’m kind of freaking out! I haven’t changed my eating patterns too much & now I’m in my second trimester I’ve been walking everyday, yoga and high intensity circuit workouts 2x/week! I’m struggling with it! Yes, my boobs are way bigger, I know blood and placenta and all that but my legs and butt and arms are ballooning up!