factors relating to conception:
•males produce sperm in vast numbers
•360 million released during intercourse
•300 to 500 reach the ovum
•sperm live approximately 2-3 days
•ovum lives one day
sings of pregnancy
•feeling faint or tired
•headaches
•frequent urination
•beast tenderness/sensitivity
why? fluctuation with progesterone (primary hormone related to
pregnancy)
morning sickness
(waves of nausea/queasiness and sometimes vomiting
•how common? 50% of pregnant women
•do men experience? sometimes
•when is morning sickness at its peak? embryonic period
•what helps to alleviate symptoms? eating more frequent and
smaller meals, etc.
twins
•identical or monozygotic twins
•fraternal or dizygotic twins
•semi identical twins
single birth:
•one egg is released
•the egg is fertilized by a sperm