My mom had ovarian cancer when she was my age. What should I be looking out for? I recently lost 15 lbs in a week and have had cramps when not on period. I also get nauseas whenever I eat.

Go to doctor. And get an evaluation. Your symptoms could be from a lot of things but are not normal and need immediate attention. Please go now.
Its possible. you are symptomatic because of anxiety of cancer at an early age.. speak with your doctor or gynecologist and have an exam to allay your fears.