Adoi, memang stressful kan situation ni! A few of my mum friends also experienced delayed period after stopping pills, sometimes hormones take a few months to settle balik normal, so jangan risau dulu. Since you've already checked with a UPT and it's negative, best to book a doctor's appointment to rule out anything else and get proper advice on your cycle, sebab setiap orang lain-lain masa adjustment-nya. In the meantime, try to relax, stress itself boleh delay period further, so be kind to yourself! Have you talked to your gynae about how long you've been waiting?