How many months is 18 weeks? I’m confused its beginning of five months right?

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💁🏽‍♀️

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Not even 4 1/2 yet . 20 weeks is 4.5 months

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You are at the very beginning of the fifth month by 18 weeks, having completed four months of pregnancy.

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Google says (via the bump)

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My due date is August 23rd.  Which means my last period according to that would have been November 16th. 
I just go by the 16th is another month 🤷
So March 16th I'll be 4 months. I'll be 17w1d.