Well just thought I would add:
My husband and I were TTC since August of 09 =( And to no prevail AF would return every month. but In Jan of 2011, I weight 199.2 lbs, mind you I am 5'3 =/ So I joined my local gym and began walking, then jogging and running.. Through this journey I fogot about TTC and actually started to get excited about loosing weight, In this time I ran 2 5k's, My first one being the Iron Girl 5k =) needless to say I was very proud, so once I lost 20 lbs, and actually dropped a jean size, started toning, and was enjoying my new body =) BAMM!! I found out I was pregnant.. Even a little weight may matter, I only lost 20lbs ( in 6 months), so goodluck, enjoy getting healthy and work your biceps youll need it for those heavy carseats =) Good luck and may God bless you all .. Oh and baby dust too!