Bad odor

Ok so um I've had a bad odor done there for a week or two, I've looked up that it can be a cause from sex. I have had sex a lot but it was with my ex and I had nothing like this before when I was with him. After we broke up I've had sex with 4 other guys, 1 guy I've had sex with 3 times and I noticed I got the odor from after the second time with him. I've done home remedies on how to get rid of the bad bacteria, is there anything in particular I should do? I'm kinda scared to see the doctor or to take a test incase. Someone help please??