i want to learn this piece by chopin in the trumpet

my question is

when it says "trumpet in Bb" should i play transposed Bb or natural Bb?
does anyone else see the last beat of the third measure of the last line having one really thick bar?
Yay fibonacci!
Quote by pwrmax
If your trumpet's a Bb trumpet then just play as written.


If you're playing on a trumpet in C, then you've got problems.

EDIT: ^ Yeah I see it too, they should be semiquavers.