In my own experience, I had a similar thing happen but not until the start of my second trimester. But I have known a few women who have had the morning sickness and some other symptoms disappear earlier, like you. My doctor was always good about getting me in if I had any feelings of doubt or felt like something was different. Have you had your first appt with your doctor? I would call him/her and try and get in, just to put our mind at ease. Sending you positive thoughts!