I was sick as a dog throughout my first pregnancy, and gave birth to a big healthy boy. When I became pregnant the 2nd time, I heard loads of different stories about people who were sick with a baby boy and not a baby girl, and vice versa. Also, people who were only sick with their 1st pregnancy and never again, or only sick 2nd time round, etc etc. As it turned out, I was horribly sick again, although this one was a girl. Ask 100 different women, you will hear 100 different stories. You will also hear that sickness indicates a strong pregnancy - again, I know plenty of women who produced healthy babies after not so much as a moment of nausea. Everyone is different, as you can see from the range of different experiences here - if your girlfriend's midwife and doctor are happy with her progress, then you have nothing to worry about. In fact, as has been said above, she should thank her lucky stars!