So yesterday I went and got some OPKs because I knew my temps alone would not help me figure out when I would O. Yesterday was CD 12 and it was negative. There was a line but it was a lighter line than the reference line so that is negative right? Then today, CD 13, I got a postitive, darker than the reference line

I sort of just scanned the directions becasue I was in a hurry to get ready for work and it said that once you get a positive you can stop testing for the month. SOOOO my question is did I O? or does the positive mean I still have a day or two before I actually do O? If I do keep testing after I O, is the LH still in my system or will it show negative again afterwards? I am a little confused