Ectopic pregnancy rates with day 3 versus day 5 embryo transfer: a retrospective analysis.

BMC Pregnancy Childbirth · 2003 · PMC270025 · PMID 14604439

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[ 3 ] showed a trend for a lower ectopic pregnancy rate in the day 3 transfer group which they attributed to the decreased uterine contractility further along in the luteal phase.

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