I am overweight as well and my doc told me to keep trying to loose weight while on the tablets. Like you everything I have read points to lower success rates if you are overweight. I am on serophene and have had 2 rounds worth so far. First one didn't work at all (still didn't ovulate) and just found out the I haven't ovulated again with this round although I have been sent for another blood test to make sure I didn't ovulate late. First time I was on 50mg and second 100mg. Have been told that after 3rd round I will have to go to hormone injections which sound scary to me.
Don't give up. All I've ever wanted was to be a mum and a teacher and I've achieved the second half of my dream and not planning on giving up on the first half.
Let us know how the blood test goes. Good luck!!