Day 1...fertilization
Day 4....morula
Day 5....blastocyst
Day 6....implantation start
Day 8....bhcG start synth
Day 11...implantation completed
Day.11....uteropacental circulation
Day 13.....primary villi form
Day 14 ....hematopoiesis starts in yolk sac
Week 2 bilamenar disc
Week 3....gastrulation.. Trilaminar disc
Day 21...fetoplacental circulation
Day 25....anterior neuropore closes
Day 27.....posterior neuropore closes
Week 4--5.....gestatnal sac
Week 5--44....somites formed
Week 6.....fetal cardiac activity by TVs
Week 7....embryonic movement
Week 3---8...embryo
Week 8 to 14......max risk of radiation
Week 9.....Early drtectant of anacepholy
Week 10.....physolog umb hernia
Week 11...tyroxine production start
Week 12...urine production start,adh functions
Week 10 to 12.....amniocentesis done
Week 18 and above......Cardocentesis
Week 20......meconium forms
Above week 20.....no abortion performed
Week 24----28.....gdm screaming
Less than week 28..... externally premature
Week 28----32....very premature
Week 30 to 32...maternal blood volume
Week 38..... lightening of pressure symptoms
Above week 42....post mature.
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