I'm really sorry you're feeling that way, but I just wanted to share my experience with you. When I found out I was pregnant at 4 weeks, I was definitely excited... but then when the nausea and exhaustion hit at 5 weeks, I felt AWFUL. I was sleeping around 12 hours every day, lost my appetite completely and was barely eating anything, couldn't cook or clean, didn't want to get up every morning, didn't want to even shower... if I wasn't at work, then I was at home in bed, either sleeping or just trying to sleep to forget about how awful I felt. I spent most of my days at work in the toilets dry heaving with nausea, and with an awful taste in my mouth all day long, and counting down the hours until I could get home to my bed. It's honestly the worst sickness I've ever experienced, both physically and mentally. I was in such a bad place and the nausea and tiredness didn't seem to be going anywhere by 12 weeks. I felt so down about everything, and even said to my husband a few times that I don't want to be pregnant anymore, and I meant it. I didn't understand why we had to go through this to have a baby, and I thought it's not worth it.
But somehow and slowly over the next few weeks I started feeling better a little bit at a time. The nausea calmed down until it disappeared finally, the bad taste comes and goes, I'm no where near as tired... I still sleep at least 9 hours every night, but at least I have some energy during the day and feel almost normal. I'm 18 weeks now, and just felt the baby kick for the first time a couple of days ago. It was the most amazing feeling in the world, feeling that little kick... it's real now that there is something growing inside me, and it isn't making me feel ill anymore! I'm excited about being pregnant now, and I can't wait for baby's arrival!
Somehow, I managed to get through that awful first trimester, and I just wanted you to know that you'll get through it too. It's understandable that it's difficult to feel excited when you're feeling that awful, and you know you're feeling awful because of the baby... I think more people feel like that than would admit it. I honestly didn't want to be pregnant anymore, as ungrateful as that sounds. It's ok to feel like that though. And I'm sure once you get through that first phase, and make it into the good parts of pregnancy, you'll start to feel excited about it.
For the moment, if you feel you need help and want to go to CBT, then you definitely should. Don't feel afraid to ask for help or to want to talk things through. I really hope you feel better soon, and just remember it's normal to feel like this, just not everyone admits it.