so where did all of these pregnant women come from?
All others?
From off the island?

From Goodwin ;) (just kiddin)

Pregnant women only die if the baby is conceived on the island. Important to remember. Especially with Sun...or not.

I guess them Other males had there work cut out for them! It's a shame it resulted in their 'friends with benefits' turning up dead. All in the name of science!