Help! I woke up this morning and got a Peak fertility (solid smiley face) on clearblue advanced ovulation kit. (Last night when I tested it was negative, open circle). I had to go to work this morning and had sex as soon as I got home... it was about 11 hours after the Peak symbol. I tested myself just for fun after we had sex and it was back to an open circle, negative?! How is this? Does this mean I already ovulated and my fertile window is literally 12 hours? And also, if so, I can still get pregnant after I ovulate since it hangs out in there right?