Ob-Gyn questions? Ask a gynecologist online.
You have not been getting two periods a month. You have been getting one period and a second episode of bleeding each month called breakthrough bleeding. This can be a result of lack of ovulation or of instability of the uterine lining. Absence of that bleeding means your cycle has changed, but does not necessarily indicate ovulation. While you are on Clomid you should either be doing an ovulation predictor kit or taking a temperature each day to determine whether or not you are ovulating.