left work today laid the bike down on right side very easy while in  1st gear probably 7mph 
 I pick it up, shake it off, ride home. I no longer have 4th and 5th gears . the bike shifts 1,2,3, and that's it. Shifter feels just like it is in top gear.Everything feels normal it just only a 3 speed now. Anyone hear of this before .  thanks