When did I ovulate?

Hi all,
First month using opk's and looking for some advice! 
I ordered tests from Amazon and received through the post on 2nd Jan (cd 10) tested right away and got what I though was a positive along with stretchy cm! Then had a few aches on 9th Jan which made me test again! Received a much clearer positive on 10th Jan! Was the first positive a false positive? 
Due for af today and so far nothing! Tested and result wasn't clear! 
Thanks