Overweight

So... I have been to the doctors today for my smear test and when I told the lady that my husband and I have we TTC since January she said we need to think about fertility testing. 
I am overweight and have a very long fairly irregular cycle (40-47 days) has anyone else been in this position and manage to conceive. 
I am dieting and lost 3lb last week which was my first week of trying to diet. 
Please tell me there's hope for us yet without assistance. 
Thank you. 
Wanna be Mommy