Best friend doesn't know...

We had a mc before we told anyone we were even pregnant. Including a very very close friend. I've been struggling with wanting to tell her but she has a lot going on right now(son had surgery, sick family etc) she just called me and told me she's 5 weeks pregnant. She thought the tears I had were because I was happy for her. And I am. I promise I am. But I don't know what to do now. Is it too late to tell her? I don't know how I will handle seeing her and hearing her talk about how excited she is. ( I see her a few times a week). My best friend and I could have been pregnant together.... I can't even believe it. Any advice is greatly appreciated.