HELP IM FAT

Hahahhaha sorry for the topic but I cant loos the waight when I got pregnant I was 110lbs now my son is 4 years old I just cant loos the waight I'm 178lbs I can never loos more then 3lbs my wedding is June 17th and I have some sexy wedding pics may 25th so my question is how did all you mamas out there loos the waight I have done abb extrasize walking and all that I am even taking waight lost pills HELP ME IM DYING I'm so uncomfortable in my body i need to loos at least 15-20lbs how did u all do it