Sorry to hear you are struggling.
You never 'forget' being a Long Term TTCer. It stays with you LONG after you bring your baby home. I always cringe when people say dumb, insensitive things about TTC and pregnancy. It still can hurt, even now when I have my two boys.
I was given a copy of a Women's Day magazine on Monday. I couldn't believe that every second picture was of a pregnant woman! It was amazing. If I was still TTC, it would have had me sobbing in bed for days.

Enjoy your lovely baby girl. And don't feel bad about what you said on FB. You might have just made ONE person think about infertility and maybe they will be kinder to someone in future. That's all you can do.