Cindy - just to check if your multiple birth comment is a direct reference to Clomiphene, coz I did querry that quite extensively at the time - not wishing to as you call it so well 'produce a litter'.
It seems with this drug there is a slight increase in multiple births but only a slightly greater chance of twins, triplets being quite rare.
Quoted from www.womens-health.co.uk,
"A further side effect of the treatment is the possibility of twins (or rarely even more). This occurs in probably about 5% of pregnancies (1 in 20 women conceiving on clomiphene)".
There are some real heavyweight potent drugs on the market for fertility, however Clomiphene is the 'first line of approach' drug and as such does not present too much of a multiple birth problem. There was a women in the UK who was carrying EIGHT babies after a course of IVF, and refused to abort any, and ended up losing them all. But that's a different topic and as it made me incredibly angry at the time I'll stay well away from that . . .