Severe depression

This has been the worst experience of my life. I am 7w1d and I have not gotten out of bed in 3 days. I went to the hospital last night for lesions on my tongue and a sore throat, they diagnosed me with oral thrush. This pregnancy is killing me. All I wanted since I was little was to be a mom, and now that I'm pregnant I'm so not excited about it. Is this normal? To be this depressed?