Trying to concieve my period is due on 5 sept .but on 28 aug i had lite spotting followed by light bleeding for 5 days is it period or am i pregnant?

Can test ~Sept 10-12: A urine pregnancy test done correctly gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) 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 therefore lead to a repeat test. If a woman has her normal regular period, then she is not pregnant, and a test is not needed.