Loosing weight

Me and my amazing boyfriend have been ttc for about 6 months (not a long time i know but for me seems like forever) but here is the annoying part my periods are irregular i seem to get one every now and then....my last one was April 22....My doctor suggested i loose a few pounds but im not sure how ? I walk alot due to my job my but thats about it....Can i have some tips or stories about ttc and loosing weight ?