hello my girlfriend is 23 days late on her period, we had countless neg urine blood test her LMP was 24/10/13. we had B HCG Serum done last 6/12/13 with negative result. our ob assured us she was not preganant she started her on duphaston for 5 days, now 7 days off from duphaston but still no period. She was diagnosed PCOS a year ago, provera was given and she menstruated. PMS symptoms are still present now could she be pregnant or just a missed period....thank u so much!!!