Sorry for hogging the message board ladies! I feel like i'm the only one starting new threads

I've been trying to search for previous threads on this without luck, so i hope i'm not repeating what someone else has already asked.

I am overweight, never lost the pregnancy weight after DD (gained about 20kg ). And then after my miscariage i weighed myself today and i've put on another 10kg )

I feel sooo embarrased about the whole subject.
I'm worried this will be the pregnancy that see's me officially looking like a slob and hitting the three digit number (i was around 70 when i fell with DD, so that gives you an idea - i'm too close for comfort).

Am i allowed to diet while pregnant?
I'm thinking weight watchers. I've had success with it before, but not sure what the rules are for pregnant women. I've got an appointment with the GP today, but i thought i'd ask you ladies.

Now you know my big fat secret, please don't tell anyone!