Am I ovulating

Briony • Wife to a beautiful husband. A daughter aged 7, a angel baby, son aged 4, a daughter 7 months old and trying for number 5 xx
I'm having ovulation pains ( or what I think they are I rarely have them ) but I've not had a positive ovulation test glow says this is my first day of my fertility week so it's possible I could be ovulating as my cycles aren't always the same sometimes longer than 40 days but after my miscarriage have regulated to 31 days 
​My question is, is it possible I'm ovulating or will I be ovulating in the next 12-24 hours I'm new to this game so really could use an experts advice?