Let your doc know you are worried about multiples. When his is doing your cycle monitoring with femera (or clomid) he will be able to tell how many mature follicles you have. If there are too many, you can always abstain (or cancel the cycle if you are doing an IUI). The people you hear about who end up with multiples are usually the ones who's doctors don't monitor them and they have no idea that they have so many follicles!