I am using a sourdough starter recipe from Sourdolady.  I am getting ready to do my day 3 feeding of OJ and rye flour.  So far there have not been any bubbles in the starter.  My question is, do I switch to flour and water tomorrow (4th day), even if there have not been any bubbles.  Or should I continue with rye flour and OJ until the starter starts to show activity.

Thanks for your help.