My period has been running late, i am scared that i am pregnant, i tried this app and it says i am due for a cycle on the march 9. i see white mucus??

Can do a preg. test: 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.