Placenta Praevia

Is there someone else diagnosed with placenta praevia? Mine was covering the whole cervix at 27 weeks. My doctor will have a look next week (will be 29 weeks then) whether it has moved up or not. My question is when do you have your c-sections scheduled due to placenta praevia? I read online about 36 weeks but also 38 weeks or later? And are you on bedrest? I know that ultimately my doctor decides and I fully trust him just wanted to hear some of your experiences :)