I took a digital first responds pregnancy test &it came out positive,next morning i took a digital first responds & it came out negative. am i prego?

Can retest in a week: Can retest AFTER 7 more days. A urine preg. 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.