I think I had unprotected sex 8 days ago, I can't remember if he used anything or not.. (lets say he didn't) So I got my last period 16 days ago and I worked it out and should be due my next one in 4 days.
I could be worrying over nothing, but I'v just felt different and that's why I'm worried. I also know I should wait until I officially miss my period, but do you think there's a chance I could be pregnant?

There is ALWAYS a chance you could be pregnant if you had unprotected sex. I think it is highly unlikely that you would feel anything different at this point even if you were pregnant. It takes a little while to have symptoms. They have pregnancy tests you can take even before you miss your period. I used one, it worked. I was pregnant.

How do you not remember that. Yes there is a chance.
Good luck

I would agree, he stops and puts on a condom or you put it on him. Once normally knows, if they require him to do it each time,

But even with a condom there is a chance, just smaller, without one, yes there is a better chance. Babies come from having sex, each time you do, you take that risk.