The clarinet is a transposing instrument. See F. G. Rendall, The Clarinet 3d rev. ed. 1971. If you're having hassle with notes from the first B over the break and up, then the challenge can be quite a lot of things. If they don't seem to be speaking at all, you may are looking to try tightening up a bit bit, in order that the reed may be in a position to vibrate more. If your embouchure is already very tight, then that you would be able to lighten up, also to aid the reed vibrate more. It would also help so that you can move the reed down on your mouthpiece. You could try a smaller size reed ex.

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