My stomach has been feeling tight bloated and a little hard. my period is about to start soon.is this just a symptom that my period is about to start?

Yes: The symptoms you describe are normal to have before your period starts. Some women, unfortunately, have gastrointestinal changes before their period, for instance: diarrhea, bloating, abdominal or stomach pain, dizziness, headaches, insomnia. If the symptoms bother you, see your doctor, there is medication (birth control pills) that can help with these symptoms.