Please some advice

I've been ttc for just over 11 months, desperate to start a family. My sister has been TTC for 1 month and just found out she's pregnant. I don't know how to feel, I need some advice and opinions. I feel so selfish as I want to cry as it's happened for her immediately yet I've been trying for a year. I'm jealous and sad that it hasn't happened to me. But I shouldn't feel like this yet can't help it. This will be the first grandchild and first for all my siblings. Very confused ?