help!!!

Brittney
I had an appointment today and up to this point we have been believing that I'm 16 weeks going off my lmp ( due July 20 2017) but today my doctor told me that I was measuring at 19 weeks I go for my first ultrasound on the 16th have anyone measured bigger than what they are or was the doctor wrong with the Original due date? I have 2 older kids and never had this problem. Also within the last week my morning sickness has came back (all day) which is something I had really bad in my first trimester any recommendations on something to ease this?