How should I stop feeling this way?

I know it's wrong for me to feel this way but how do I stop? Ive been trying to get pregnant with baby #2 for a while now and so far 4 of my friends have announced they are pregnant with baby #2. All in the last 2 days. I am so happy for them and wish them nothing but the best. I just wish I could be a part of that but I'm not. I'm yearning so badly for another baby and a sibling for my first who is already 2 years old. All my friends had their first after me but are now having their seconds before me. I hate feeling this way. I'm trying to swallow it down and not let it overtake my emotions but each announcement feels like a punch to my gut. I know their pregnancies have nothing to do with me but it just reminds me that once again I wasn't chosen to carry a baby this month or the many months I have been trying. Sorry for my rant.