When a girl is pregnant, what are some symptoms of early pregnancy?

Varies. Some common symptoms of early pregnancy include missed period/menses, feeling tired, feeling sick (nausea +/- vomiting), larger/tender breasts, mood swings, and food cravings. Having listed this, important to note that different women may experience any, all, or none of the above. Even within the same individual, one may experience different symptoms with different pregnancies.