Good day. i had my period from july 4th to 8th & then had unprotected sex with my husband on july 20th & 21st. is it possible that i could be pregnant?

Yes: Many things are possible in life. 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 one gets her normal regular period, she is not pregnant.