Ovulation early?

Liz
Hi just a quick question! This is my first month doing BBT so I just want to understand this better. 
Originally Glow said my peak day would be the 25th. As you can see I had a temperature dip on the 17th, followed by a pretty sharp rise. I took an OPK yesterday and got a positive. 
Took my BBT, entered and Glow said that it was consistent. Just want to know if this is how the temperatures would go to indicate ovulation is/has occurred! 😊