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I saw billboards like this driving around Florida:

Billboard image

18 Days from conception my HEART was beating [...] Prolife Across America

Is this true?

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    What a horrendous typesetting.
    – gerrit
    Nov 13, 2015 at 11:31

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The fetal heart may begin to beat at approximately the 22nd day after fertilization which corresponds to 3 weeks and 1 day after fertilization i.e. 5 weeks 1 day of pregnancy. Between 5 ½ to 6 ½ weeks based on the last menstrual period, a fetal pole or a fetal heartbeat may be detected by vaginal ultrasound.

Angiogenic cell clusters are the building blocks of what will become a fetal heart tube known as the primitive heart tube. The primitive heart tube develops around three to four weeks and goes through an incredible transformation transforming into a four-chamber heart.

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    3 weeks 1 day after conception is 5 weeks 1 day of pregnancy, by the way. Pregnancy dating is weird ;-) (just so the OP can relate the two dates in your answer)
    – YviDe
    Nov 12, 2015 at 8:13
  • @YviDe-Thanks and I will add this information in the answer!
    – pericles316
    Nov 12, 2015 at 8:18

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