Uy, 15 days na? Mama, kailangan mo talaga magpatingin sa doctor or OB mo para malaman kung ano ang nangyari, hindi ito normal kaya please don't wait pa. Could be maraming reasons, pero hindi ako dapat mag-guess lang dito, kailangan ng proper check-up mo.
Alam ko it's stressful, a few of my mum friends din nag-panic noong naging irregular ang cycle nila, pero the best thing is to see a professional agad. Go to your nearest health center or call your OB para ma-schedule kaagad, okay? Sending you strength, mama!