Ay, that's quite sudden talaga! So you got your period the night of Sept 26, tapos pag-gising mo ng 27 may ibang symptoms na? Para ma-advise ka properly, kailangan ko malaman ano yung "ganto" na feeling mo, like spotting na mas heavy, cramping, dizziness, or something else? Anyway, if it's unusual compared sa normal period mo or parang may off feeling, mas safe na i-check mo with your doctor para ma-rule out kung wala namang concerns, lalo na kung first time mo to.