That sounds pretty right to me...my docs send me for a BT 7DPO (days past ovulation) and then for another 7 days later to check for pregnancy, so what your doc has told you makes sence...Normal lutel phases are around 14 days, but this can be different for everybody....See how you go testing on the 22nd...it 'may' be too early to get a positive, but i would think if you use an 'early' pregnancy test then you could get an answer by then. If you do get a negative however, but AF still hasn't arrived, then test a few days later....good luck...