Disappointed

So I'm really disappointed bcuz my period was a few days late and I thought this time I was finally going to get my BFP. But unfortunately my period came today. I'm wondering why can't I get pregnant again?.... I mean it wasn't this hard getting pregnant with my daughter. We've been trying for 2 years for baby #2 and nothing has happened. It's really frustrating. It's like no matter how bad I want it it just doesn't happen