Regarding the people commenting on your size--If your Dr. isn't concerned, you shouldn't be and their opinions just don't matter. Tell them your Dr. isn't concerned and your Dr. overrules their opinion anyday or tell 'em to stick it where the sun don't shine. I did that a couple of times when I was pregnant with Mims and blamed it on hormones

Regarding friends who bailed-- Do they have kids of their own? Is it possible they are jealous? I have a friend who I became estranged from when I was pregnant, she just didn't want to hang out with me or our group of friends anymore. She told me later that she had been trying to get pregnant herself and was jealous that it happened fairly easily for us. Once her little bundled was on its way, she came right back to the fold and explained to everyone.
I don't know if that helps with your situation or not.

I hope this helps you feel a bit better. Heaven knows pregnant gals need to feel good as much as possible to counteract all the changes going on.