I am sad because the people I have supported (and who have supported me) for over a year are now not interested in talking to me anymore and it hurts
I think the issue is that you havent given them very much time to come to terms with your news in relation to their own fertility journey and you need to reassess your expectations.
Your OP says you're 9 weeks pregnant, that means it's probably only been about 6/7 weeks since you found out and told them. That is a very short period of time to expect them to digest the news, process their own feelings/emotions and be supportive at the best of times, never mind in the run up to christmas in the middle of a pandemic.
Christmas can be a massively emotive time for people, everything focusses on the magic of family and children etc, and right now those other couples may not have the level of support they would usually have due to covid so they may be struggling more than usual. So many people without fertility issues are struggling with their MH at the moment, a pregnancy announcement could have been the straw that broke the camels back for those couples and there just isn't the same support available to help them which could mean it takes them longer to process their reaction and be in contact.
You need to be careful that you dont push these people out entirely just because they havent been quick enough to be supportive. Knowing the kinds of struggles they have had you should have empathy to how they might be feeling and allow them a bit of time to process before writing them off. Six weeks is no time at all to expect people to have processed their own emotions and be your support.
I have a pre teen DD but due to health issues I have a pretty much 0% chance of naturally conceiving another child. I have known this for over a decade and have come to terms with the fact DD will be my only child. That doesnt mean that every time one of my siblings, cousins, friends announce the birth of their 2nd/3rd/4th child it doesnt bring those feelings of grief and loss back to the surface. I am always insanely happy for them and I dote on all of my nieces, nephews, godchildren, friends kids etc but after the initial announcement where I congratulate the happy parents to be, I invariably need to go low contact for a little while while I get my head together, and when we do talk i keep it 100% baby free.
All of my family and friends know this and respect my choice of how to deal with my emotional response and they know that if they want to talk about pregnancy, morning sickness, cravings etc then they do that to someone else and they come to me for everyday chit chat unless and until I bring it up, which is when they know I'm in the right mind space to be able to have those conversations.