Missed LH surge?

Elyse • 38 yrs old. 1 missed miscarriage at 8 weeks. TTC 14 mos since our loss. 6 failed IUIs. 1st IVF 12/7/15. FET 01/21/16. FINALLY PREGNANT!!!!!!!
Is it possible to miss my surge if I've been opk testing first thing in am and before bed? Cd18 and still no positives.