Just need to vent

So we have been trying and I tell my self that it’s okay my time will come. But it hurts me to see my fiancé want to be a dad so bad and I have not been able to give him that . It seems like everyone around us is getting pregnant and just so bad want that to happens to us . Here I though I might be I was feeling sick and tired all the time for it only to be a head cold then today I got to the bathroom there was a little blood but my period was over last week and I just got out of my fertile window and we had sex tonight and now my stomach hurts a little bit idk what to. I just want to be a mom. But instead I’m finding out I’m going to be a great aunt which my so happy about but when is it going to be my turn