Discomfort

My period is 2 days late and I'm experiencing an uncomfortable feeling in my pelvic area. Its not painful. Its like a tightness and pulling above my lady bits. I've been testing negative on all pregnancy tests for the past 2 days. I'm starting to think maybe I ovulated later than what I expected. Has anyone ever had this feeling? How long after your missed period did you test positive for pregnancy? My periods are always on time I've never had a late one except for pregnancy.