The best replacement for hpt is opk.

The best alternatives to hpt are rated as following:
★★★★★  opk
★★★★★  blood test
★★★★  hvt
★★★  addie
★★★  lpt
★★★  rgv
★★  ept
★★  cgt
★  evaporation line
★  trifecta
★  line hpt
★  evap line
  taylorism
  blood tests
  non digital hpt

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Speaking about hpt, one probably shouldn't forget about ectopic.

Other search terms related to hpt and their ratings are:
★★★★★ ectopic
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Google Trends

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hpt
opk
blood test