Confused

So I told my best friend that I was pregnant as soon as I found out and all she's said is 'well it's still early days' that was 3 weeks ago and she hasn't really spoken to me since then even though I've tried to talk to her. We both have completely different lives I have a mortgage, boyfriend and a job where she still lives with her mum and doesn't have a job. Is she jealous? Why is she acting like this?