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It has been my experience that oblong embryos rarely develop to the blastocyst stage. I have no idea why. Just an observation. So, you concern is justified.
6 out 11 mature? Hmm. Were there a lot of smallish (i.e. around 16 mm) follicles at the of hCG? Sounds like there may have been two batches of follicles on this stim - a group of large, mature follicles and a group of small immature follicles. Although eggs were retieved from the smallish follicles, they were immature. The ultrasound images looked good on paper, but the reality in the dish was different. The "mature" that didn't fertilize may have been borderline mature - nuclear maturity (i.e. halploid) but cytoplasmically immature (i.e. unable to fertilized in the presence of good sperm and/or unable to respond to a sperm that got inside).
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