Ay, 15 days delayed is quite significant, sis! Please go to a clinic or hospital na para ma-confirm properly with a blood test or ultrasound, that's the only way to know for sure, at importante na malaman mo agad. A few of us mums have been through this, and honestly, wala kaming peace of mind hanggang confirmed ng doctor na. Sending you strength, and pls let us know how it goes!