Talk to your Dr, but nearly everything you did before, you can still do. The only things you'll need to avoid is too much ab workouts, like push ups, weight lifting; and as you get bigger, listen to your body and stop when you need to. No need to push yourself.
Mild workouts shouldn't hurt if you've been doing them and your body is used to it, might wanna ask your doctor just in case. Always eat healthy though, for baby and for yourself. Can also help maintain weight.
You can still work out but not insensibly! especially in the first trimester, you want to be very careful. You can do some light exercise like swimming or walking. But don't lift heavy weights or go run Marathon or anything intense like that.
Probably not but id ask your doctor :)
I've known plenty of ladies that worked out their entire pregnancy and was fine as long as they don't over do it. I myself didnt gain much weight its all mostly baby and I just been eating healthy