I am not apart of this thread but from my experience,ILs are sent out at the end of the month to the first week of the other month (so end of April first week of May). Those who get ILs at that time have CC dates from the 20th of march to the 20th of April. The cut off date for IL each month is usually the 20th.
My CC date was Feb 11 & I got my IL in the first week of March for April interview.
Just support & keep each other in your prayers (that is if you are religious)