I'm pregneant

I'm 5weeks pregneant and can't believe it! I'm 20 & my husband is 22, I don't think we're ready but if I tell him that I don't want to have this baby he will look down on me for the rest of our marriage! I don't know what to do. I'm also Christian and have always condoned abortion but right now I have to admit I might have though about it!!!! 
I'm scared!!!!!