The best replacement for no fetal pole is yolk sac.

The best alternatives to no fetal pole are rated as following:
★★★★★  yolk sac
★★★★  yolk sac at 7 weeks
★★★  yolk sac 6 weeks
★★  yolk sac at 8 weeks
★  yolk sac at 6 weeks

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Speaking about no fetal pole, one probably shouldn't forget about yolk sac.

Other search terms related to no fetal pole and their ratings are:
★★★★★ yolk sac
★★★★ no yolk sac
★★★ high hcg levels
★ blighted ovum
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no fetal pole
yolk sac
yolk sac at 7 weeks