OBGYN's hear this complaint frequently and of course, will examine your reproductive organs. However, most one sided lower abdominal pain is not due to problems of the either ovary, but mainly due to muscle tension that crosses the same region where the ovaries are located.
It could be a hip or back muscle.
This image shows your hip flexor, called the iliopsoas muscle. The x's show where trigger points of this muscle are typically located. The red dots show the areas where people complain of pain
This image shows a back muscle called the quadratus lumborum or QL for short.
Both of these muscles can refer pain into the lower abdomen as shown in the shaded red dotted areas. This can commonly be interpreted as ovarian pain.
How to self-treat:
Hip flexor stretch:
Begin in a half kneeling position with your front left knee bent at a 90 degree angle. Next, squeeze the glutes and tuck in your tailbone, while gently lunging forward to feel a stretch in your right hip flexor. Switch sides. Do 2x 30 second holds, twice a day.
Quadratus Lumborum stretch:
Straddle a chair. Side bend to the left side and imagine you are trying to lift your right ribcage up and drop your right hip downwards, to feels a stretch on right side of the body. Switch sides. Complete 2 x 30 second holds, twice a day.
If pain persists or gets worse, see a women's health physical therapist.