3 days late. Should I test now?

Here's my only problem... I just started having regular cycles for 2 yrs now. Everyday for 2 yrs I've been on time, but this time late by 3 days. What are the chances of going back to my old cycle of having a period once every 3 months? I want to take the HPT but afraid I'll just be disappointed... Dose age matter as well? I'm in my late 30s

Anyone have this similar thing happen to them?

Also, if I do buy HPT which would you recommend?