Last period july 20. had sex july 27 w/o protection i ovu. on july 30-31.spotted aug1-11. i'm a week late. took preg test on aug.12&29 both negative.?

Pregnancy unlikely: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If worried and still no period after another 7 days, one can repeat a urine pregnancy test one more time.