Usually one follicle takes over, and the others dissolve. Twins is a possibility, but in natural pregnancies they're about 10%-15% as far as I know, so even if you have a familial tendency it is not guaranteed.
Cramping might be your body's way of telling you it's near, either because of the hormone levels or because your uterus is getting ready, or your tubes and ovaries are preparing for the egg to move.
