My period is 12 days late. tested on day 4 &6 with negative results but ive had waves of nausea off and on and now im getting some mild cramping. could this be that im actually pregnant or is period on its way? (i usually have regular cycles)

Hard to guess: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is the common cause of a missed period, if sexually active.