I vaguely remember my first ever FET at monash( years ago now) was natural with no support and I basically spotted from transfer to AF, I rang the clinic thru my TWW and they didn't really care or offer me progesterone, I think i ended up insisting on getting my prog tested which was bordrline low. We were really angry as it was obviously a failed cycle and we felt it had no chance from the start ( not to say it would have worked but who knows). My FS wasn't interested when I questioned him on it and after a few more issues we ended up swapping clinics.

I understand that in theory you might not need it with a natural cycle but if we had natural cycles that worked we wouldnt be doing IVF!!!!!!

Good luck, its frustrating dealing with clinics etc, when you feel like just a number. We have all our hopes riding on our cycle and want everything to be done to give it the best chance, hope you get your bfp hun xx