Why have my ovaries have been hurting ever since I started running?

Ovarian suspension. The ovaries are "suspended" in space and attached to the uterus and pelvic side wall with a ligament( "guide wire"). Gravity can have painful consequences when running, as "bouncing the ovaries are similar to testicular "bouncing"- not a good feeling.That is why men wear athletic supporters, and athletic women can use some abdominal "support".