Morning Sickness

Ok so I have had severe morning sickness from day one. I went to the doctor because my dates were all wrong and told him I know when I ovulate usually so I knew going from that how far I was. Well I'm 12 weeks today and I hear everyone saying there's is going away. My doctor told me mine will probably go away at 16 weeks. Could this be because of a big fibroid? Does anyone else have any?