I know a few of us, about 6 that I know of, from 2/25 got called this week for 4/30 class.
Looks like the pattern has been that they call right around 14-18 days prior so I'm guessing the selection board meets just before that.
Next class is mid May I think, so I'd expect calls around the end of the month.
The 4/30 class got calls on 4/11 and 4/14 that I know of.
I know the waiting is tough but be patient it will come.
Good luck!