I took a home pregnancy test and it came out positive, i was using clearblue and it said 2-3 weeks, i went to the doctor 23.02 but they couldn't see a?

Can retest in 1 week: If not sure whether pregnant or not, can retest in 1 week, and contact doctor if result is positive. Home urine pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period.