Opk went from low to peak and back to low is that normal or ok?

Jessica
My SO and I have been TTC for over a year now. I just started using OPK to help. This Wednesday I took it and it was low I took on Thursday and it went right to peak and then this morning I took again and it's back to low. 
Does this mean I only ovulate for one day? Has anyone else had this before. I am nervous that this could make it harder for us and have been putting off involving a DR.
Thanks for the help!!! 
-Jessica