5 days delayed: Pregnant or not

Hello! May i ask po if may possible pregnancy po ba sa case na ito. Delay na po ako ng 5 days. I took pt po last oct 26 and october 27 (delayed on the 5th day na). Both negative naman. We had protected sex naman with my spouse using condom and withdrawal method together. Concern lang po ako kc di pa ako nadadatnan. Ano po kaya cause ng delay. Salamat po.#advicepls #pleasehelp