Should I put myself first before friends?

One friend I have is currently pregnant and going through a lot of things. I can't cope emotionally and mentally since I found out I was adopted last week or so. She's mad because I didn't reply to her update message today about her being pregnant and going through illness too.

I don't feel able to deal with her at the moment. Personally, I don't want support from anyone. My problem is something I have to do by myself, and the only way I can truly focus on myself is to take a step back, evaluate my life and decide the next steps to take. I am currently in therapy (started first session today), and it isn't going to be an overnight process to get over.

Should I be there for her, or should I put myself first?