Period 12 days late, more white discharge than normal, negative pg test. causes??

Pregnant ?: It could be you did not ovulate or had a false negative test if concerned check a serum pregnancy test

Pregnancy test: Most home pregnancy tests will detect a pregnancy as early as 10 days or so after a missed period. If it was negative, you should recheck the test within a week, just in case you checked too soon. Occasionally discharge will change right before your period as well.