BBT implantation dip?

Britney • Isaiah William 9/9/15! ♡♡
Hey ladies.. I'm not to get AF for another week plus 2-3 days and my bbt dropped a whole degree. Have any of you ladies had a dip like this at 10 dpo and was pregnant? Hubby leaves for training for 2 weeks on Saturday (stupid army lol) and I'm hoping to have good news for him when he returns.