Low Breastmilk

Hi all mommies, My baby is 4.5mth now and wish to know if my breast is no longer producing milk since I only pump 1hour per day without direct feed. I m taking milk booster and lactation milk + oats too. Since baby birth I can get like 6oz per day but now only 2oz. I noticed it dropped tremendously since 2weeks back when I m having ovulation and period. Any advise for this sad mom?