Question: can a pregnancy test be negative and turn positive?
Answer: Rise of pregnancy hormone GeburtshilfeFrauenheilkd 2014;74(7):661–669. If you test too early, a test may not pick up enough hCG to turn positive. If you're testing before the day of your expected period, you may see a negative result – even if you're pregnant – if: Your test wasn't sensitive enough for early testing.