Unsupportive

I just found out I’m pregnant with twins . I’ve told my loved ones and my boyfriend is happy. However, his mom is the only one negative. We are stable and a adults ......it’s like seriously what’s your problem? I would never be disrespectful to his mom. I just will always be extremely uncomfortable with her now. I don’t know how to shake it or feel about it. I’m extremely family oriented and this is devastating for me. I don’t know what to do?😢 Do I include her or just keep the supportive around? Has anyone dealt with negative grandparents?