I Have 6 Pills That Are Red In Color And

I have 6 pills that are red in color and has the numbers 933147 on them. I have a urinary tract infection and making sure that these are the pills my dr gave me last time for it. they are 500 mg... Wanting to make sure I am taking the right thing. My paperwork on it has come off the back of the bottle.. it says cephalexin.