Hi there,
Not to worry, as long as your braces are still on, your orthodontist or dentist will be able to realign the molar for you pretty easily. From the image, the rotation looks rather mild and should be easily corrected. Do let your orthodontist know, perhaps he/she is working on other areas first and intends to align the molar soon.
Hope this helps.
Warm regards,
Dr Geraldine Lee
Orthodontist