Is there a difference between Norgest /eth est (ogestrel) 0.5/50 and Norgest/eth Es (Crysell) 0.3/.03. I was given the second one recently i think as a generic substitute for the first one and have now been bleeding for 15 days straight and it started in the second week and I am just hitting sugar pills today where my period usually occurs on the ogestrel. Waiting for a call back from OB, but just wondering. Can they substitute a generic with different doese of hormones?