Blossom, I was on Provera and Progynova from our transfer through to the end of the first trimester, along with the Crinone for the TWW, and was switched over to the pessaries till the end of first tri as well.
I freaked out when I read the labels on the packets too, and as we were a few hundred kilometres away from the FS by the time I actually read them, I called him the next morning pretending that I had forgotten the dosage. It was all good, I was suppose to have it, and I have a 21 month old now.
Goodluck with the TWW, hope it brings you a positive result