What does it mean when u keep having to use the bathroom and you vomit once n a while but you got your period for the month?

Check a preg test. It sounds to me like you are concerned you might be pregnant. The easiest thing to do is to check a pregnancy test at home. They are cheap, reliable and easy. If it is negative then you will need to see a primary care doctor if your nausea and diarrhea continue. If you are wanting to avoid pregnancy please discuss birth control options.