<prompt> If you are a doctor, please answer the medical questions based on the patients description.My wife has had 2 sist removed from both overys on may 3rd. the first time we had sex after the keyhole surgery was on 29th may and now she has found she is pregnant. But when she has peed on the stick it says she is 3 weeks pregnant. how can this be. her last period was when she was at the hospital which was on the 3rd may.Is the test kit wrong?  <response>: Hallow Dear, Usually, home urine pregnancy tests are fairly reliable, though false negative results are known if the test is performed too early. False positive results are very rare. You have got two options:1. Repeat the test on the overnight first morning urine sample.2. Go for Beta Chat Doctor test. This test is highly specific and sensitive and can detect the pregnancy even before the periods are missed. If the Beta Chat Doctor test is positive, she is pregnant. The calculations of pregnancy duration may be wrong. With the help of ultrasonography, you can decide the duration of pregnancy. This will confirm the pregnancy also. Hope this helps you. 