Is it normal to have mild to moderate pain in ovarian region or the pelvic part throughout the month especially a week before periods?

Pain is never normal: It is normal to have periodic visits to an OBGYN and this might be a good time to see one. An exam may tell you why this is happening and may suggest a treatment. It might be that you are particularly sensitive to the ovulation process even if it's fine and the info can help you relax. A Rx of proper hormones may relieve this - have an exam.