Best Friend problems

I'm starting to think my best friend isn't speaking to me. Just to give you an understanding of our relationship, she and I don't speak often and we live in different states. Typically we talk about once every couple weeks and we get together about once every six months. Even though we don't talk very much these days, we've been best friends for 13 years and we are able to pick up right where we left off when we get together.

She has been having fertility problems and has suffered from at least one miscarriage in the last year. She has been trying to have a baby for 2 years and it has broken her heart so much. Recently I found out I am pregnant and it was unexpected, but I'm so excited. I told her over the phone as soon as I found out and she seemed okay at first. Since then (6 weeks ago) I've texted her 3 times about various things and have gotten no response. It's not like her not to respond. One message even talked about how I miss her and we should meet up soon. No response.

I don't know what to do. I believe deep down that it has to do with me being pregnant, and I know it must be hard for her to deal with, but I don't wanna lose my best friend over it.