My wife is having menustral like pain just after 5 days of ovulation... Is it sign of pregnancy?? Plz guide and suggest

Possible. It could be some discomfort from implantation, but it could also just be premenstrual cramps or cramping from blood in the pelvic area from the egg cyst that ruptured for ovulation. In about 5 more days consider testing for pregnancy. Spotting or light bleeding may accompany implantation, don't assume bleeding is a period.