Here's my two cents...
I know this site doesn't support the HCG plan but I was on it for a short period of time and along with it, the dr. prescribed adipex. It worked for a while as far as the energy and suppressing the appetite but after a while my body got used to it and when it would wear off I felt like I could sleep for days! Once I decided to stop the shots and pills, of course the weight came flooding back and brought lots of friends!
Personally, I wouldn't recommend that you take them unless you are a very strong willed person and know that you can come off of them when you conceive and still be able to maintain what you have already lost. As boring as it may sound, If I were you, I would stick to the life long way of eating healthy and exercising.
There again, just my opinion. My DH and I are wanting to have children too! I wish you well on whatever decision you make and pray that you will conceive soon