How long do you feel ovulation pain for?

Katie
Bit of background.... This is my second cycle off BC. First cycle I didn't get a temp shift so don't think I ovulated. 
Today I've had a few instances of stabbing pain a few inches to the side and below my belly button - I'm on CD18 so wondering if this is me ovulating...?
Any help appreciated :)
I haven't started TTC yet - timing of my already booked holiday means I can't start till next cycle anyway or if it happened first time, I would mean we couldn't fly - so haven't used OPKs - will next cycle though 

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