Opinions please!

I am 33 and my husband and I started TTC this past December.  I got pregnant in January, but miscarried on March 4th.  My doctor says she wants me to wait 6 months and lose at least 30 lbs before TTC again.  I am 5'10 and weigh 235 (yes I know I weigh a lot but I carry it well and am otherwise healthy.  Normal blood pressure, cholesterol, no diabetes, etc.).  I have seen MANY women heavier than me have normal pregnancies.   I feel like she may be being extra tough on me and I don't know if another doctor would necessarily tell me to wait.  Should I listen to my doctor and wait until I can lose the weight?  I feel like I'm too old to be waiting much longer, especially because I want two children.  Advice appreciated!!