Stabbing pain at cycle day 17

I was sat at a family meal today and had one sharp stabbing type pain around where I would imagine my left ovary would be. It was so bad it that it took my breath away. It went away for a few minutes then I had a second sharp pain for a few seconds. Then nothing. What could this be? This month, after being diagnosed with low fertility levels, we've gone for the bd every other day method so I've not been ovulation testing. This app suggests ovulated about 2 days ago