Help!

Kandice

So normaly my period last 5-7 days. Heavy

This time i started a day early its been medium ish and dark red with clear mucus. And the blood has turned brown and almost completely stoped and im jist entering day three of my period this morning. We were hopeing for a positive pregnacey test then AF showed early. Is this AF or something more serous iv had some abnormal pain in my sides too