Is it safe to fly when I am 23 weeks pregnant?

Hello doctor,

I had my second anomaly scan at 18 weeks and the reports showed the impression that the placenta is at posterior wall mid and lower part grade I. The lower margin of the placenta is 1 inch away from internal os. Also, there is a breech presentation. What does it mean? The doctor told me to take bed rest and to avoid heavy work and sexual intercourse and keep an eye on any kind of vaginal bleeding. I am really tensed about the condition. Is it life threatening for my baby and me? What other precautions do I need to take? Should I go for another ultrasound after one month to check whether the placental position has improved or not? Also, I am a working woman and need to travel approx 40 km daily. What should I do? Also, I wanted to ask if I can fly at around 23 weeks.