Whatever i've gotten even small cut, it takes a little bit for bleeding to stop. if i have hip & knee replacement, i am nervous as how is bleeding going stop when they cut inside my body?

You should discuss this with the surgeon doing the procedure. There are tests that can be done to determine if your bleeding stops normally. This may be a good idea to do before the procedure to make sure your blood is able to clot normally. The surgeon can also explain to you what is done to control bleeding during these procedures. Best of luck to you!