Glow vs. Baby Center vs. iPeriod

Erin
I'm so confused. I'm 5wks1day and Flow says baby is now the size of a chocolate chip, Babycenter says the baby is the size of a sesame seed, and iPeriod says the baby is 1/16th of a inch. Last night I dreamed the embryo was the size of a jumbo shrimp!
Seriously though, who's right? Do I have to wait til my ultrasound?

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