Hi Elzi,
Congratulations !!! I took progesterone all the way till 13 weeks for one reason only and that was because I have had a previous bleeding. At 13 weeks that is when the placenta takes over and produces the hormones required. I said to my high risk obst that I would like to take it all the way as it had worked so well and he pointed out that it would be useless to take it till fullterm and true to his words as soon as I took it for the complete 13 weeks thou.
Good luck!!