hope this helps
The most critical period of its development is between three and seven weeks after fertilization, when a simple heart tube assumes the shape of a four-chambered heart. In fact, the heart actually begins beating by the 22nd day of life.
When you are 5 weeks pregnant, your baby's heart is made up of two tiny channels called heart tubes and they're already hard at work, beating to their own drummer (it will be weeks before those beats become coordinated).
i had my doctors appointment today the doc afformed me i was 6wks 3days today at the time of my first ultra sound i was approx 5wk 5days no heartbeat only yolk sak and development begfining so the doc said this was normal and heartbeats are usually detected in wk six or even wk seven the nurse tried to say there may only ever be a yolk sac and no bub but the doc and the lady who performed the ultrasound said no heartbeat or fetal pole can be normal at the early stage of five wks now im confused
I went for a scan a few years back and there was no feral pole but everything else went back a week later there was a fetal pole.
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