It could be - that is what happened to me this month - I have been advised to test every 12 hours once you get a line that is almost as dark as the control line so that you don't miss it.
I tested at 12pm one day and then evening the second day, so it is highly likely I missed the actual surge,
The OPK predicts that ovulation is coming within the next 12-36 hours so I would suggest you get bding just in case!