OK, so March 3rd I had unprotected sex. I ovulated between the 5th and 6th . I have 24 day cycles sometime 1 day early sometimes one day late . I was suppose to start on March 18th and nothing . I took a distal weeks estimator by clear blue yesterday morning it was negative I took the test apart on one strip had 1 dark line 1 faint line on the other strip you can barley see an outline of a faint line . Anyone ever taken these tests had a negative then later a positive ? Ever take them apart ?