Multiple pregnancy mummies

Dear mummies with multiple pregnancy, is it we need to deliver early as 37-39 weeks..? My gynae mentioned that it might be difficult to bring baby out at full term as babies might be too big at that time.. This has been weighing on my mind ever since.. & yes, it does make me feel stressful abit as well.. Of course the best time to have vaginal delivery is when the head of the babies are down.. If one is down n the other is breech, c-sect will still be better according to the gynae..