Sour relationship in pregnancy

[cookiemonster18]

I'm in my ninth month of pregnancy and finding friendship with one particular friend extremely hard work. This friend, is/ was my best friend however since being pregnant I've felt the relationship change. We've always been super open with each other but I just get the feeling like there is an underlying issue lately...
Recently I had my baby shower in which she organised, whilst it was a fab day, there was tension because I had decided that my partner should come which resulted in a stern telling off (men weren't welcome!). Following the shower, I've been burnt over the cross fire because I didn't sit next to her (I actually sat down first) and because whilst I said thank you on two occasions it wasn't good enough because it wasn't on text.
I literally feel like I can do no right and this friendship is causing me upset and I genuinely don't feel that I like my friend very much at the moment...
Please note, this friend is not ready for kids and I know that for sure, so struggling to deal with the excuse of "jealousy"?
I'm not sure if I should keep trying or just leave it here and would welcome thoughts!!

The thank you thing is a bit meh, I probably would've messaged her. I agree on the partner at baby shower though, it changes the dynamics of the situation.

Have you actually asked her if there is an issue?

I was going to say jealousy but not in the way you think, as in she's jealous of having to share you more? It sounds like she's becoming possessive, maybe she's afraid of losing you to your new family life?

I said thank you in a speech, thank you when I left and thank you in a message, I suppose that's why I'm struggling with that complaint!

With regards to my partner, surely if I wanted him there then that's ok?

I agree with your friend about male partners at the shower. It's generally just female friends and relatives and it does change things.

Yep sounds like she's possibly a bit upset the dynamic of your relationship will change once the baby is here. Although it does sound like she's still keen to be a supportive best friend by throwing the baby shower even with no interest herself in having kids yet. I'd just remind her you value her friendship but don't get drawn into a squabble if she tries to instigate one.