Pain and cramping days before period on right side pelvic area. like sharp pain. period started 3-5 days late and again sharp pain on right side with blood clots in period?

Ultrasound: If you're having severe pain associated with periods and especially if it hurts more on one side than another then it likely means you should have an ultrasound done or at least a physical pelvic exam to look for any ovarian abnormalities, such as an endometriosis cyst. You should consider using birth control pills or an IUD to help regulate your period related pain. See a gynecologist!