I have seen 3 doctors 1 was a obgyn they gave me ambien 10mg, Tylenol 3s. The 2nd a general doctor gave me?

flexril and hydrocodone (vicodine) and the last doctor a Gereral doctor prescribed Valium 10mgs and oxycodone 30mgs. The last time I saw the last doc I signed a contract that i cant get the oxy from manyone else. What is the law when it come to medication and several doctors and meds. I have pretained all the meds from docs and i have not lied about anything. Is there anything I should know about seeing different docs different meds and different pharmacey?