Sabar ye, I can understand the anxiety ni, tunggu-tunggu period is such a mental rollercoaster. Duphaston memang boleh delay period, so it's hard to say right now whether it's the medication or something else, but honestly at day 15 post-IUI, if there's a pregnancy, the hormones should be strong enough untuk show on UPT dah. I think best you check in with your fertility doctor, they can do a proper blood test (beta hCG) which is way more reliable than UPT, and they'll know your exact cycle and medication schedule to give you a clearer answer. Hang in there, the waiting is the hardest part.