I've been on progesterone for all of my successful pregnancies, though I didn't need it til 9 weeks with this current one. My dr has said you can't harm the baby by taking progesterone even if you don't need it.
As for the rest, I've been on baby aspirin for all of my successful pgs as well and two years ago, we found out I have a clotting disorder. I am on 2 baby aspirin a day, 200 mg of progesterone once a day, and high dose folate (2mg per day) though I'll be coming off the progesterone within the next few weeks and will likely drop down to one baby aspirin a day til 35 weeks around the same time.