Does this mean she's going into labor real soon?

I'm at home with my older sister and her stomach is hardening, like real bad and mild pain and we read that they are called "braxton- hicks contractions" and her doctor isn't answering, and she's worried that she might give birth sooner than expected. Her due date is the 17 of March. Does anybody know about this?
Yes, tell her to contact her doctor fast!
No, it's normal.
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Does this mean she's going into labor real soon?
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