I'm in tears, extremely jealous and hurt.

One of my friends just told me she's pregnant. I feel absolutely awful for not being excited, happy or none of them emotions. I feel angry, hurt, and very jealous. I've been trying to have another baby since 2011. I did give up trying and haven't gotten my hopes up for about a year or two now. I'm absolutely heartbroken. she has a few kids already. I have 1 child, and please don't get me wrong I am very grateful for my 1 child, but I wish I could have more of my own. she said she had been struggling to get pregnant for 3 months. I wish it only took me 3 months to get pregnant. it kind of made me feel like she was rubbing it in my face(she knows how long I've been trying for another one).

Why am I such a terrible friend and mom(for wanting more kids and for feelings this jealous and angry and hurt about having just 1). I'm in tears right now.