right lower abdominal pain at 5w2d

This is my first pregnancy.. I have periodically noticed a right lower cramping pain that comes and goes, sometimes it feels cramp, other times it feels like a pulling sensation. I'm just wondering if this one sided pain has happened to others? Other than that I have had pretty bad nausea and fatigue but no bleeding or anything. I haven't seen a doctor yet other than to have an ultrasound booked (Sept 15) and a referral to a OB.