hello ammeck.
from your signature i can see you received your 2nl in march; but when i look at the bulletin i can see march cutoff is 29000. How did yours happened?
You know the visa bulletin comes out 1 month in advance. So for instance, March visa bulletin will be announce this month and this will also include advanced notice for April cut-offs. So those who will be current in April will know it from the March visa bulletin and they van get their 2 letters in this month. Just check the February visa bulletin and you will find the advanced notification for March also.
In March last year when the April cut-offs was announced, it included the advanced notification for May. I hope this answer your question.