I am 6dpo I have pain in pelvic region when I stretch that area is this due to the scar tissue or could it be due to ovulation? Happens every cycle.

Mittleschmerz. In mid-cycle the egg is released from the ovary along with a small amount of blood that irritates lining of the pelvic cavity transiently. The german name above means "pain in the middle" (of the menstrual cycle). This is a normal phenomenon and burden that women have borne since eating that apple.