Too much weight gain!!??

Isabella
Hi pregnant mommies, time is going by and we are getting closer to meet our lil ones. But i am getting worried about my weight. My pre pregnancy weight was 97 lbs and now i weigh 115lbs at 24 wks! I gained 18lbs already! I am concerned  that what if i gained weigh too much? Please comment on how much weight dos you gain in your pregnancy? By the way my height is 5'4" and this is my second pregnancy