If you take a look at the thread about ovulating twice in a cycle, I've put a link that explains a little about it.

Other than that...try googling "Polycystic Ovaries", you'll find heaps of information. Don't be confused with PCOS (Polycystic Ovarian Syndrome). Just because a women has polycystic ovaries DOESN'T mean that she has PCOS which can (and often does) affect fertility and conception.

Lisa