Ovulation without LH surge?

Ally • Mommy of a beautiful soon to be 5. TTC #2 Happily married for 10 years and counting
I have been on clomid 100mg and in my last scan  on 03-12-15 my doctor said I would most likely ovulate in the next 36-48 hours. I have been using OPK and they keep showing negative. Can you possibly ovulate with LH surge?