Am I really 18dpo?

[promise07]

Hi all. FF currently says 18dpo and I *always* have low post O temps. I've been getting light lines the past day or so that I believe may be BFPs...but I'm really 18dpo then there's a huge problem as I couldn't get a good line before yesterday.

Thoughts?

6ea9f4 Ovulation charts on FertilityFriend.com