Hi i recently had intercourse on the 1st of july i was supposed to get period on the 13th it's now the 21st took test it neg. i'm not sure what to do?

Can retest in 5 days: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.

Repeat HPT in 5 days: Assuming your not pregnant, there are a large number of causes for skipped period or abnormal menstrual bleeding. Some of these include failure to ovulate, severe emotional stress, obesity, anorexia, polycystic ovarian syndrome, other hormonal causes, diseases or abnormalities of the reproductive tract etc. Often the cause is unknown. SEE: http://bit.ly/19cKee5 http://bit.ly/1Cn3tey