Girls, I measured my BBT — after ovulation it was 37.2°C, today it's e…

Girls, I measured my BBT — after ovulation it was 37.2°C, today it's exactly 37.0°C. 11 DPO and 3 days until my period is due, we're trying to get pregnant. If it dropped like this, is it all over? Definitely a negative? Or can 37.0°C still be pregnancy?