Irregular period or pregnant ?

Ok so I had my normal period 4 weeks ago today, and it was really long its normally 3-4 days but it lasted 8 days. I should have started my normal period sometime this week. But I had it last week instead. I normally get cramps a week before my period starts and then they go away right before or during my period. My period or whatever it was stopped on I think friday or saturday and starting yesterday I started getting af cramps??? What the heck is going on??? Could I be pregnant???