The short answer
Yes, occasionally. False negatives are most common, usually from testing too early or with diluted urine. False positives are rare but can follow a very early miscarriage or certain medications. Confirm a positive result at the clinic, which also checks the pregnancy is in the right place.
Use first-morning urine and follow the timing on the kit. See pregnancy test.
Answered by Dami Women's Clinic (다미산부인과의원), Yeouido, Seoul · Dr. Ko Sang-hyun, OB/GYN. General information, not a diagnosis. Emergencies in Korea: call 119. Medical disclaimer · International Patient Center