Workout/weightloss/toning tips during pregnancy?

I want to lose some weight ( i am obese according to bmi charts) and get fit or toned or something for the summer so I can dress super cute and cool (as in not hot in my usual baggy sweaters and sweats) and not be self conscious about all the cellulite all over my butt and legs and my floppy saggy arms and the second boob thing I got going on by my armpits. I want to do it a healthy and safe way because I am 10 weeks pregnant