5 weeks 4 days pregnant

I’m so scared. My boyfriend and I got to see our baby two days ago on a sonogram due to an early miscarriage in September. I’m farther along this time than I was last time. The doctor said I’m measuring a day ahead and everything looked absolutely perfect. This morning and last night I’ve just felt not pregnant, I haven’t really had any distinctive symptoms and today I just feel really disconnected, like I don’t believe I’m pregnant at all. Has anyone less experienced this and had a healthy pregnancy?