I personally don't like weight as a measurement.

When I was 65 kilos, I was in size 10 clothes, and I'm only 5'2". I have a lot of muscle and always weigh more than I look.

Because of that, I wouldn't consider 66 kilos overweight!

And forget the whole thing when you are pregnant, I don't go near the scales unless I have to to watch fluid retention. Putting on weight in pregnancy is a good sign that your body is doing what it's supposed to and it's growing your bubba.

Relax for the next 6 months at least and enjoy it