I'm on my 4 th day of my period is late. I been feeling nauseous all thru the day but dont throw up. I'm hungry and I urinate frequently. Just trying to figure what can cause my period to be late. My period been irregular twice now. Can I he menopause early. My doctor said I'm too young for that but I dont think so. I'm having on and off cramping and I ran to the bathroom thinking it's my period. Mild back pain on one side and feel twinge in my lower stomach.