Hello, I'm 20 years old and about 3 years ago my period went from 4/5 days to just 2. I'm really worried is this normal? Does it say anything about my fertility? I've never been on any birth control

Is this the first time or many 2 day periods?

I've been having 2 day periods for about 2 years

Sounds like a new normal has been established.

Some women have shorter periods than average, some longer... hence an average. If you are having regular cycles each month, you are likely ovulating each month as well. The length of your period isn't an indication of any fertility concern.