Friend makes me feel guilty

Hello all,

Sorry for this long post that's about to come...

Short background:
So I don't live near my hometown where I grew up and where I have all my friends and family.
It's an hour driving away, so we don't meet up that often.

Two years ago my boyfriend and I bought the house where we live now and I have one (yes, only 1) friend here who lives nearby.
She's there for me when I need her, keeps my secrets and is a good friend.

Though once in a while she can act a bit odd or insulting, but I always let it slide.

Anyways, I, myself am 18 weeks pregnant and have some moodswings when I have a busy day.
A few weeks ago we planned a girlsnight where she comes over to my place, we have dinner together and watch some movies. I had a horrible day and my mood was below zero...
She came to my place and announced her pregnancy. I jumped up and hugged her, and we talked about our pregnancies the entire evening, I was so happy for her!

The day after that I sent her a message on Facebook saying I hope my bad mood didn't seem like I wasn't happy for her, that I cried when I thought about the announcement and how happy I was (hormones...). She responded quite cold to be honest, that she did have the feeling I had to put a lot of effort to seem excited. I told her that I was afraid my mood would seem like I wasn't happy or excited but that I really was. She then replied that she really was looking forward to telling me the big news. I, again, told her I just had a bad mood and that it didn't have to do anything with how happy I was.

Anyway, this happened two weeks ago and since then she doesn't really initiate conversation or asking me how I am in my pregnancy (while I try to text her a few times asking how she's been and how her appointment with the doctor was).

I feel guilty for not reacting how she wanted or expected me to, but on the other hand I don't want to feel guilty for this. I had a bad day though I was actually really happy for her.

Two weeks after this happened and I still feel bad about it.
I don't really want to talk about this with her because:
1: i feel she could've told me face to face when she was at my place
2: she makes me feel attacked when we have conversations like that and I tend to take all the blame and feel bad even more for not sticking up for myself...

Hope you guys have any thoughts on this?