May girlfriend is pregnant.. because she is 2weeks and 2 days delay.. but she take a pregnancy test and the result is negative.. then she go in ob gyne the ob tell to my girlfriend she is not pregnant.why she is delay?she is pregnant?

It could be too early to test.

What test was done at the doctors office, a urine test or a blood test?

Wait until her next period is due. If she misses it, she should test again using first morning urine, or get a blood test done.

There's no way to diagnose online, so we really can't tell you if she is pregnant or not, or what else could be going on.