They could also inhibit oestrogen, which usually inhibits the production of FSH. So a decrease in oestrogen in the blood will naturally increase the levels of FSH.
Fertility treatments increase a woman's chance of becoming pregnant, although the treatment may not always work. On the other hand, because the treatment boosts the production of mature eggs, it increases the chance of twins or triplets. Multiple pregnancies carry a risk of complications and may lead to premature or underweight babies.