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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
It is not unusual to ovulate more on one side than the other each cycle. If you ovulate more on the left usually, the left is your dominant side and if you ovulate more on the right, well that is your dominant side. If you lose an ovary and it just so happens to have been your dominant ovary, well then the other one will have to take its place, but will usually need more help to produce good follicles/eggs. It can also happen where each side is pretty equal throughout the total yearly cycle, meaning no side is more dominant than the other.
When I lost my right ovary my consultant told me that they don;'t know which side the egg comes from, or if it alternates each month etc etc. He couldn't answer my question as to whether or not it would affect my fertility