Need opinion nyo mga mamsh

Last week ksi LMP ko is 39 weeks na ko pero sa pinaka ultrasound ko is 37 weeks p lng ako then that week sinilip ni ob si baby and 36weeks sya ayon s laki nya. Pero bakit ganun sabi nya dapat manganak na daw ako by next week kung ndi i cCS daw nya ako. Ganun ba talaga dapat? FTM just need to know your thoughts about it. Thank you