The first two weeks are critical for the success of the pregnancy, since, during those 14 days after ovulation, the embryo has to implant in the uterus, and any irregularity can cause implantation failure or the death of the embryo, even before the woman is aware of her early pregnancy. This is how the experts from the MARGen clinic in Granada explain it in an article published in the magazine Frontiers.
A team of British and German scientists has managed for the first time to observe what happens in a human embryo between 16 and 19 days after fertilization, during a key stage of its development called gastrulation.
Human pregnancy lasts for about 38 weeks from the time of fertilization, or conception, until delivery, or 40 weeks from the date of the last menstrual period.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.
