negative pt but 3days delay

ask kolanh po sana may sumagot🙏 3days napo kasi akong delay it if ever pang 4th pregnancy konapo ung pang 3rd po is nakunan ako and ever simce ma mabuntis po ako and matapos ung prenancy at kapag bumabalik po ung mens regular po ang mens ko never na delay usually panga its either early or sakto lang sa expected date but now po kasi im 3days delay na and still negative paren po ung pt or maybe because mumurahing pt lang po ung ginagamit ko nag mamatter po ang brand or price ng pt? para if ever branded po mabaili ko to confirm