White discharge. Normal or any issues!

Good evening doctor my age is 45 years nearly actually from last 5 -6 months i noticed a white discharge from vagina Just after period ended like on day 8 to day 14 I have white discharge and in some months just before period starts before 1-2 days I get discharge but this present in few months and in some months it's not present like today my period starts but I don't get discharge before it but that day 8 to day 14 I get discharge white colour every month I don't remember exactly about previous year wheather I have it or not may be present I don't give attention but today I thought let me ask wheather this is normal or not and occasionally lower back pain also I have one is ki on every period I get lower back pain but sometimes other that periods also I get lower back pain please tell is this situation normal or any issues