The best replacement for period blood is implantation bleeding.

The best alternatives to period blood are rated as following:
★★★★★  implantation bleeding
★★  miscarriage blood
★  spotting
★  miscarriage
  pregnancy blood
  implantation blood
  dark red

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Speaking about period blood, one probably shouldn't forget about tissue.

Other search terms related to period blood and their ratings are:
★★★★★ tissue
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period blood
implantation bleeding
miscarriage blood