Random period/possible pregnancy question?

I normally always have a 7 day period, heavy flow with clots for about 4 of those days, then it lightens up with clots for the remainder 3 days. Well this cycle my period came 3 days early, bled not quite as heavy but for 3 days. It stopped, and then had some very light spotting on what would be day 5. It went away. Then on night of what would be day 6 had brown spotting. Now nothing, but I’m super nauseas (lingering) can’t eat, and running warm with chills. All of this is just strange. Wasn’t sure if anyone else has experienced this or may know if it is normal? Could I possibly be pregnant?