is it normal to feel depressed?

Since I found out I was pregnant I have had nothing but problem after problem I could loose my baby due to these or baby could come very very early. I'm only 20 weeks. I was also bleeding early on & told not to have sex my husband then betrayed me. I feel like everything is just destroyed & I am constantly holding back tears all day everyday. The doctors suck & don't help with my complications. I have no friends family my husband is deployed & my therapist is on maternity leave. I literally have no one I even had to quit work due to all of this. I feel so down!!