Quote Originally Posted by Nemesis Digital
Anything from added stress, change in diet, environmental factors can cause an early or late period.
These are true, but also her starting her period does not mean that she is not pregnant. It's rare but there are plenty of women that have even had their period the whole 9 months or the first couple of months. As you get older your period changes (I am experiencing this for myself now). Her starting early could be a number of things and nausea could be part of the cycle. If I were you I would do one of two things: 1. get a pregnancy test 2. wait out the cycle (if she is just spotting or ends early then you might have a problem). Good Luck!!!