Unhappy pregnant

I am very shame of myself but In my 12 weeks I am complete depressed. I dont know what to do. I have a good job, husband and family but I am not happy about my pregnancy at all. I am grown up so I need to take responsibility for my future child but I feel so miserable, sad and worried. I feel like my life is ending and I see only difficulties along. I feel quilty for those thoughts. How to pull out myself from the situation. Sorry for my english. It is not my native