Toyota Repair: My 1992 Toyota Previa Van, toyota previa, toyota parts

Question
When I went out Friday to go somewhere my van wouldn't start, nothing, nada, no noise or anything, I then asked someone to give me a jump by the time he drove around to pull up next to me it started right up and was fine the rest of the day.  I didnt drive it saturday.  sunday was a repeat of Friday, didnt start at first, then about 5 min later started right up. Today, Monday it started right up.   I put a new starter in it last spring and I havent had any problems with it as far as running goes.  do you think this is going to get worse or more frequent?  should I have my battery checked?  
thanks for your help   Melissa

Answer
It's not the battery that's causing this because once the battery is dead it will not start unless jump started,you said it started after waiting a while, I would recommend replacing the starter again preferably with a remanufactured one from the toyota parts department.