late ovulation???

I am over a week late (been testing since 13th) and all my tests keep coming back as BFNs (negative). I decided to go back over my BBT charts (I've been tracking by bbt not opks this cycle) and I noticed on CD 30 (3 DPO according to Glow) that my BBT was 98.4 (97.2 CD 29). Could I have ovulated late? If so when should I test again.