Losing weight?

Okay so I wasn't really EXPECTING to get pregnant, I actually wanted to lose some weight first.

I gave birth to my daughter 09/2014 and the baby weight I had with her I just was never able to lose. I gained 60-80lbs that just never went away.

Now I'm 9w and I want to get off a LOT of this weight off but don't know how I can without harming the baby?