Will your insurance cover an accident from before you owned your car?

No, it's highly unlikely your insurance company would cover damages to your vehicle that occurred prior to your policy's inception (actually, I know of no insurance company that would cover prior damage, for the simple fact that you didn't pay a premium for that damage). Think of it as "you get what you pay for." Your insurance carrier would be under no obligation to pay for damages for which it didn't collect a premium.

i was in and aqccident some1 hit me from behind on the 3rd at 5pm i had no insurance then at 11pm i got insurance will that insurance company help me get my car fix. when the accident was the other persons fault