maternity leave

I'm not working quite as much, the reason is that I accepted a six week subbing assignment next spring, April 12 to be exact. I will be taking over for a sweet kindergarten teacher who is having her first baby that day. Who knows, it may even come a bit early.
I am only allowed to sub a specific number of days as going over that number will mess up my "teacher retirement." I certainly don't want to do that!