I am so glad I am not alone! I probably outweigh all of you guys, much to my chagrin. I was 325 carrying my daughter seven years ago, and am under 440 with this one - down from over 500lbs at the end of 2010/beginning 2011. I've lost 42 of those pounds just since finding out we were pregnant. We've had infertility issues so I think the metformin may have helped, but what a blessing!
I had trouble birthing my daughter - I can't deny that - but only because the doctor didn't do his job and give me the ultrasound he said that we needed. Long story short I had her vaginally but she was over 12lbs and got stuck. The dr pushed her back in me twice so her head passed my pubic bone a total of five times in/out. It broke us both. During that time I was very healthy, had no diabetes or high BP or anything you'd expect. Toward the very end my BP krept up, but returned to normal after delivery.
This time around, at over 100 pounds larger and having been very traumatized last time around I have a new doctor... a team of them, actually. lol We're seeing four separate people to manage different aspects of this pregnancy. I'm having a lot of ultrasounds and all of the doctors and techs have been nothing but supportive.
ANYWAY... I am so, so thankful you girls replied b/c even if I do outweigh everyone I have felt alone and I am also sick of seeing all the negativity online about obese pregnancy. I can relate to being just fat and not looking pregnant, but my family knows my body changes, and that is good enough for that.
I got to thinking about it all today after mustering up the courage to post this post, so I wrote a blog on 'my big, fat pregnancy'. You are welcome to read it or not if you want. I'm just so thankful you are all here!

Happy and Healthy rest of pregnancy to all!
https://thefluffymummy.blogspot.com/2012/03/my-big-fat-pregnancy.html