Single pregnancy uncomplicated 
Passengers are not allowed beyond end of 36 weeks. Clearance not required but doctor’s certificate is needed after 28 weeks
Multiple pregnancy uncomplicated 
Passengers are not allowed beyond end of 32 weeks. Clearance not required but doctor’s certificate is needed after 28 weeks
Any complicated pregnancy 
Clearance certificate from doctor’s is required / needed

Generally, expectant women are discouraged from travel from 28 weeks to avoid complicating pregnancy related complications.