2nd month BBT...need a little help please

Renae • 💙 '09....💙 '11....💔 '14.... 💔 '14....💔 '15....💔 '16....💔 '17....💜 12/12/17
Can someone please tell me if Ive ovulated? From what I can gather I had a slight dip on cd16 and then rise on cd17, so would I have ovulated on cd16? But checking the difference between last month and this month the dip before ovulation isnt as big as last month....please help