Periods and clomid? HELP!?

So I took clomid from my doctor on days 5-9 which was dec. 24 through dec 28. My periods are always irregular and all over the place. Has anyone that used clomid not get a period after and they are not pregnant? If your using clomid do you have to get a period to know the clomid had made u ovulate? Assuming it not pregnant.