Nightmares

I'm 11 weeks and I literally have nightmares every night. I am also having trouble falling and staying asleep. I'm pretty nauseous throughout the days still, and I have this fear or bad/ afraid feeling looming over me. Is this normal? I am happy and in a good marriage. So I'm wondering Is it because subconsciously, I'm afraid of being pregnant? Or ami just extra sensitive to everything these days?