Should I book this flight today?

This morning I checked the ticket price it was in the 180s this afternoon its in the 150s. Looked online theyre saying the best prices are on Tuesdays.

My flight is going to be in 3 weeks.
Update: I wish I could give you all best answers! (except Pearl)
Update 2: Thank goodness I listened to you guys I bought the ticket for mid 150s after I got you all responses. Checking back today, Tuesday, the same ticket I bought is not worth 190s!! Thanks!
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