Oh sweetie, I am so sorry. I can only imagine how hopeless you might feel right now especially after being prepared for a much better outcome. I am sending all kinds of hugs your way. I pray that those four end up being fantastic, and that your journey is headed in a positive direction. And if they don't work out, take some time for yourself and we will be ready for you anytime you are ready to come back and talk.
ETA: I noticed in your siggy that you were on an MDLupron protocol. Someone else can correct me if I'm wrong, but my understanding is that the MDLupron protocol is expected to produce fewer, albeit better quality eggs. Again, I hope that this is the case for you and you have four rockstars.