chamydia diagnosis ?

I'm not sure what's your specific question.
Are you interested about chances to get Chlamydia due to your sexual life?

Anytime, a sexual intercourse is performed without protection, whether a pull-out method is used or not, the partners are at risk to get infected with Chlamydia.
Chlamydia transmission occurs during vaginal, anal, or oral sex, via the exchange of bodily fluids through mucous membranes in the anus, mouth, and genital areas.
Because there are often no symptoms for Chlamydia infection, many infected people may unknowingly pass the bacteria to their sexual partners.
Diagnosis is made with laboratory tests, urine test and swab test of cervix (infection usually starts there)
Swabs can also be taken from the throat or rectum, cause there is a possibility of infection there, too.

The title to my question got changed...I had asked which guy I got it from????

I thought you said the test result was negative? Have you taken another test that was positive since then? Also, keep in mind that it's possible that you got a false negative with the first test.

When Chlamydia is contracted, symptoms may or may not appear.
If they appear, that will follow the transmission in a period of 1 to 3 weeks.
Very often, this infection goes as a asymptomatic or silent disease.
and, false negative results are possible.