I have had two menstrual periods 17 days apart is that ok or should i go to the er?

See Doctor: It is not normal but it is not an emergency. you should see your doctor - not the ER.

Probably OK: It is not uncommon to have an irregular cycle or 2, as our cycles can be affected by any number of factors. However, if your are consistently (ie for 3 months) having your cycles every 17 days, they last for more than 10 days, or are extremely heavy for more than 5 days, you should see your doctor.