2 questions and I really need help:( Going crazy with these opks!

Ok so on Sunday I got a solid smiley on my cb advance digital. I had also new using the cheap opks. As of this morning I am still getting a strong positive on the cheap opks. DH and I dtd Sunday and that was  the last time so far. 
​Question 1: what is this conflicting opk results and which do I go with?
​Question 2: did we miss the window to get pregnant because we stopped after sex on Sunday?