Tell your doctor about your concern. He/she may talk to you about a) options in devices, large head balls in metal or ceramic cups seem to have less frequency of dislocations; b) post-surgery precautions that we all had to obide by while our soft tissue was healing, i.e., no bending beyond 90 degrees, no crossing your legs, etc. Those restrictions pretty much go away after a period of time, depending on your doctor's best instructions.
My metal on metal, large ball, hip feels as stable as my natural hip ever did, and while i am still healing, I have had no concerns about dislocation since after the first four week "precautionary" period.