I got endometriosis I started my period today 3 wks early no pain its usually every 8 wks for 4 days.

Irregular periods. Irregular periods are very common. If you normally have regular periods and then suddenly have one that is early or late this usually gets better on its own with cycles returning to normal over the next few months. If you are not wanting to be pregnant you should discuss birth control which will also help with cycle control and with endometriosis.