Hi, i have been tensed about my belly for the past 3 years as i had the same problem. Before, my tummy was 20 inches but then it was 30!! Everyone called me a model and it was so depressing when every single one of them then said, "aww, you've lost it, you are over eating" or "are you pregnant"...many even said congratulations to me!!! When i looked into it, i found few problems as well as some mistakes that i was overlooked...1)before you start your belly exercises, go for cardio! use treadmill for a month or two with balanced diet and once u see that your stomach is thinner than b4 then start abdominal exercises, Reason: if ur stomach is fat and u do abdominal exercises, it tends to build your abs under the fat! which will make it look bigger! 2)once you start abdominal exercises, do it on alternative days...give your stomach muscles time (a day off) to know whats happening and which shape to get in...DONT DO IT EVERY DAY...3 times a week is the best. 3)get yourself tested! your stomach might be producing alot of gases or not digesting food properly. 4)having bigger tummies a week b4 periods is nothing to worry because body produces water, just walk alot. 5)drink lots of water but luckwarm and after every 1 hour, NEVER drink 2 glasses one after the other,that makes it a water-belly.
P.S: eat less and healthy, alot of cardio exercies and going to bathroom everyday!
My waistline is 20 again and i am happy as hell. Please remember that your belly wont grow thin over a night, it will take some time but it WILL GROW THIN!!! give it the time it needs...motivation and patience, is the key to a flatter tummy...goodluck to all