I'm currently on my period and i'm having very severe cramps on my lower abdomen that travel to my lower back. is this normal?

May be: Dysmenorrhea is painful cramps with menstruation. It may be mild or severe. Persistent severe cramps can sometimes be associated with endometriosis, a condition where uterine lining tissue occupies other areas in the pelvis. If the cramps are recurrent and disabling, see your health care provider.

It could be severe: dysmenorrhea but you should be checked by your physician to be sure it is nothing worrisome