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Stretching out the stimulation to at least 9 days will probably result in more mature eggs and better fertilization. However, brace yourself, a high porportion of the embryos from PCO patients always arrest at the cell stage. Pronuclear morphology is a good pronosticator of the developmental potential of the embryo. Abnormally small pronuclei is a bad sign and embryos exhibiting this trait usually arrest prior to reaching the blastocyst stage. The small pronuclei observed in some of your embryos are probably related to the short stimulation. If they stretch out the stimulation to 9+ days, they may not see this next time (assuming you try again).
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