I know it's nice for others to be happy for you and maybe they are. Maybe they're not. So what? Does them not saying congratulations in any way take away from your pregnancy? Are you less pregnant or less happy about it? Someone saying congratulations, either genuinely or through gritted teeth doesn't change anything, unless you let it affect you.

You have what they don't and may never be able to have. Let go your expectations. They're entitled to their grief just as you're entitled to your joy. let go the guilt as well. It doesn't help you and it doesn't help them.