What week is 3rd trimester?

Mommaof4 • 29 yrs old. Mom to- 👦🏼, 👧🏼, 👧🏼, 👶🏼

I am 27 weeks on Tuesday with baby #4 and I have several pregnancy apps. One app says 28 weeks is the third trimester while another says 27. Just curious what majority think.

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