Anak, this is something na kailangan mo talaga irereport sa doctor as soon as possible, hindi ko maiiwanan ito, okay? A late or missing period after unprotected sex during your fertile days needs proper medical attention to know what's happening. Please go to your OB or clinic para ma-check ka properly, they can do a test at alam na kung ano talaga ang nangyari. Huwag mag-alala mag-isa, marami sa amin ang dumaan dito at ang doctor ang best person na makatulong. Ingat, ate.