can't smell fish or stinky odour

Hi mommies and mommies to be, I used to love fish, all sorts of fish. But ever since this pregnancy I can't seems to smell and eat them. It make me sick to to my stomach and the scent of the fish was just too strong it could make me nausea and puking .. is it normal? Well now i just had to eat chicken and meat. Anyone has the same issues.