Bbt before period

Hi, what's your bbt (in celsius) when period comes? My period is late, but bbt isn't 37°, it was 36.8° today. I know for sure that i ovulated on 6/05, today is 16dpo. If you're pregnant I know that bbt should be 37 or more. so I just want to know whats your bbt when period comes or if you were pregnant what was in this days?