Brassavola bloom from the area between the leaves, or on a single leaf you will notice where the leaf separates about an inch or so above where the highest root grows out. Normally, a thin "sheath" will emerge and then a spike that eventually grows buds emerges from the sheath. If you look around at some of the previous posts members have posted under the photography section for Orchids of all genera not in bloom, you will see Cattleya usually bloom from a sheath. My Brassavola like to grow the pbulb nice and long before they bloom. How tall are your leaves, with pbulb?? If they are too small it may be awhile before it blooms.