TTC Depression

Hi I'm new here. My fiance and I have been ttc properly since July. We're only on cycle 2 but I just got another bfn. I was so sure I was pregnant. My period was 5 days late, and I was nauseous all the time. I got a bfn on Saturday when my period should have come. I waited until today and of course AF showed up. I know it's not been a long time that we've been ttc but I'm just terrified that maybe it can't happen for us. I know it's slightly irrational but I can't help feeling like I'll never be a momma. Do others feel like this?