Overweight and pregnant!

Hi, I wonder if someone can offer some advice.

I went to the doctors the other week as I found out I was pregnant, I am overweight but have lost quite a lot of weight over the last year. Obviously not enough though as my doctor has told me he will need to refer me as I am still quite a bit overweight.

He didn't really explain what would happen at the referral or what it all meant.

i was wondering if anyone had experienced it at all?

Thanks