I'm currently 19 and a half weeks pregnant and haven't been feeling very well the past five days. Tried to work yesterday and got so over heated and dizzy I had to go home after half an hour! All I want to do is sleep! I've been sleeping all day and I'll still sleep through all night! Feeling a little headaches and a little nauseated but mainly just sleeping!! I feel like I have no enegery at all?!