[Lizzie]

If she was pregnant she would not be getting symptoms that soon. It's very likely that her new birth control is making her feel that way. She should read all the information about side effects and what is a normal amount of time to feel them. It's very common to get pregnancy like symptoms when starting a new birth control.

If she is really worried, like Sparrow said, she can take a pregnancy test. She has to wait at least fourteen days from the time she had sex before she can take one though. Any sooner than that and the reading won't be accurate.