Advice please...

So it's been a while since I was fit. I've been skinny my whole life but when I was deployed overseas I decided to begin bodybuilding. It worked. After a few years life got in the way and I slowly fell off the deep end fitness-wise... when I found out I was pregnant I was 184 lbs. I'm 5'7", so I already knew then that I was overweight. I just went in for my 7 month appt today and at 29w3d I am 210 lbs. I barely heard the rest of my appointment. I've since come home and just bawled. It's been a while since I've eaten healthy-never been good at that at all... but im also a lot more stagnant these days. I just can't believe I've done this to myself, yes, but to my baby!? This isn't fair to my child. I'm just way emotional about this now and I don't know if I can even physically do enough to help myself and the baby right now. Is anyone else worried about weight? This is my first and now I feel like a horrible mom. I can't believe I let myself go that far... 21lbs gained in the last 2 months alone. :'(