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When does the third trimester start

Adele • Sat, Apr 04 • 27. TTC baby #1 for 11 months, born July 2015. TTC baby #2 since march 2016 BFP Aug 2017 MC at 5 weeks BFP Oct 2017 🌈 Rainbow baby due July 2018🌈

I'm 27 weeks today. Does 3rd trimester start today or next week at 28 weeks? All my books say 27 weeks but I've had some people tell me it's 28 weeks

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