Hi Tellytubby,
I have been on weight watches for about a month and lost 6kg before I fell pregnant. I am going to continue with it as I believe it is health eating and I feel full after each meal still, But I did have a little easter egg today hehe. I use to go for a hour walk everyday but cut it down to half an hour. Im not as strick as I use to be.
I think it is a good idea to talk to your GP.

I hoped this helped and hope you have a healthy and happy pregnancy