I was in prometrium
200mg once a day with my 3rd pregnancy
..and still i m/c at 17&1/2 weeks.. and i stopped taking the prometrium
at my 15&1/2weeks( i should only take them for 12 weeks, but my dr told me to continued the left pills..) still don't know the reason why,, if it's bec. i stopped taking the progesterone supplement or there is some thing else..