Is it normal to see blood twice during labor?

Patient's question:

No

Doctor's answer:

Here is the translation of the provided text into English, with the carriage returns preserved as instructed and all other Chinese text translated:
"Bloody show is a relatively reliable sign of impending labor. It generally occurs about 24-48 hours before delivery. At this time, the bleeding may be very light, just a little bit, just as you described."