Anyone else be upset by this?

I've recently had my 9th loss. I went on the depo after and recently come off, but I'm struggling to conceive and having ovulation problems.
One of my friends knows how upset I am. I've mentioned a few times that almost everyone around me is pregnant and I'm really struggling to cope with the emotional pain.
She's expecting her 3rd, and will talk about her pregnancy all the time. Whenever she has a pregnancy related question she comes to me.
But today she's actually messages to ask me if I can look after her youngest next month when she goes for her 20 week scan.
Would this upset anyone else? It just seems like she hasn't even considered my feelings, and she's got a whole month to find childcare so why ask me, and why ask me now?