I have been signed off work since 27 weeks with various issues.
I'm now 30 weeks. my sick note expires in 6 days so I've been to the doctors today to ask if she can issue a new one until I'm due to go on maternity (beginning of April).
She told me that if you are signed off work after 25 weeks pregnant and not perceived to return to work then they don't keep issuing a sick note 
I questioned this and said I was sure that this was not the case. Albeit I didn't get a new sick note and she told me to contact my HR department with this information and should they have any issues then they need to liaise with her directly.
AIBU to be confused about this? To be honest I'm stressing out about it as there's no way I can return to work 