過(guò)期妊娠是指

A、平時(shí)月經(jīng)周期規(guī)律，妊娠達(dá)到38周仍未臨產(chǎn)
B、妊娠達(dá)到39周仍未臨產(chǎn)
C、平時(shí)月經(jīng)周期規(guī)律，妊娠達(dá)39周仍未臨產(chǎn)
D、平時(shí)月經(jīng)周期規(guī)律，妊娠達(dá)42周仍未臨產(chǎn)
E、平時(shí)月經(jīng)周期規(guī)律,妊娠達(dá)40周仍未臨產(chǎn)