I took clomid to help concieve my second dd. It worked on the first try
However, my SIL took it at the same time and ended up with triplets. Very rare and she was on a higher dose than I was. i would urge your sister to research before taking any drugs. I would also suggest the book 'Taking Charge of Your Fertility' It's a great book that I think every woman should read whether or not they are trying to concieve

