Ah sis, I know it's scary when something feels off like that. Pero dahil 14 days ka nang delayed at may persistent pain, kailangan mo talaga mag-check sa doctor or OB, hindi ko dapat i-guess kung ano yan, at mas importante na marinig mo mismo from a professional what's going on. A few of my mum friends have been through delays din with different causes, kaya really, walang one-size-fits-all answer dito. Please don't worry too much while you wait for your appointment, pero go ASAP ha? Take care of yourself.