BBT 30-31 day cycle

Sarah • First baby Thomas Declan 💙
Anyone offer any advice. 
First month tracking my Bbt, second month ttc.
I have a 30-31 day cycle
Got a strong positive opk on Saturday afternoon but still no temp rise (Monday morning here) 
Today is CD20. Can anyone reassure me that there's still time to ovulate? Am I needlessly worrying?