They are excellent: The hpts are quite accurate, but they have their limit--maybe too early for the test to pick-up in cases when testing too early. In your case, you said you are wt 21 wks, no hpt is needed because you should be showing. The uterus should be quite large now and should be up to your belly-button level. Plesse consult doc for care..Don't delay. Good luck.
Answered 5/28/2015
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