Last month i was really late on my period. (the 27th)i'm cramping severely and getting signs of another period. its really early. what's up?

Many reasons: You need to see your gyn or a gyn, as it would be from hormones being messed up, must r/o pregnancy( prob not) could be form endometrial or uterine problems so u need an exam, blood work and an ultrasound.

Uncertain: Reasons for irregularity include weight gain or loss, breastfeeding, alcohol use, eating disorders, marked emotional stress, endometriosis, uterine fibroids, cervical polyps, polycystic ovarian syndrome, excessive exercise & pregnancy. When a girl has just started menstruating & around the time of menopause periods can be irregular.