How to Get Pregnant – Ch. 1: Natural PregnancyUploader: Vuzuru 3 years ago Subscribe 3
Home Common health questions Pregnancy Back to Pregnancy. Of some million sperm deposited into the vagina near the cervix in a typical ejaculation, only , ever get into the womb. Chemicals released by the acrosome first dissolve the jellylike cumulus oophorus, enabling the sperm to pass through it and reach the tough zona pellucida. When the mucus is sticky and thick, not as abundant, and translucent rather than transparent, it is difficult if not impossible for any sperm to gain access. At this time, the very tough outer membrane, the zona pellucida, forms around the enlarging egg. If the HCG level goes up as it should, then an ultrasound five weeks after fertilization defined as a seven-week gestational-age pregnancy should show a normal fetal heartbeat.