If she's favoring the warm end rather than the cool, perhaps you're right. Either way, congrats and good luck.
Have you palpated her at all? Before ovulation and during the "building" process, you should be able to feel a string of pearls about two thirds of the way down her body. They begin very small (think pea sized) and gradually become closer to golf ball-size just before ovulation. You can count these as her potential eggs. After she ovulates, they will no longer feel so hard but they can still be felt and counted. Any "slugs" among them will feel a little different.
Ralph Davis has a good vid of palpating a female if that helps.
YouTube - Pet Project 08 - part 1 ( follicles )