My right ovary size is 4.6 * 2.8 * 2.1 in cms. Left ovary is 4.1 * 2.8 * 1.8 in cms. Is it normal.?

Possibly normal. Normal ovary size is about 2-3 centimeters but this is dependent on age and where you are in your menstrual cycle. You need to check with the doctor that ordered the ultrasound to make sure that there are no problems.