Pregnancy and failing as a wife

I feel so bad for feeling this way because I know that there are women who struggle to have babies and that's all they want. I found out in the end of October I'm pregnant. I'm currently 20 almost 21 weeks and due July 31st. I have been horribly sick this pregnancy and my doctor just days oh its normal pregnancy stuff. I had to stop working I can barely do anything around the house or for my husband. I cant even shower alone without getting sick.. I feel horrible for resenting this pregnancy but I feel like its costing me my marriage, my family, and my life. I had depression before the pregnancy and I feel like it's worse. My doctor wont give me any meds for it because I wasnt on them before pregnancy and I just feel hopeless and scared. I need advice, help, or just to get this rant out...