Working and braxton hicks.

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So I'm 21 weeks tomorrow. I've had braxton hicks really really bad the past 3 days. I was off work today and noticed it wasn't bad at all today. I work anywhere from 40-55 hours a week on my feet. I asked my aunt who is a nurse, what she thinks it is and if I need to see my dr. She said that when she was pregnant (20 years ago ) they put her on bed rest for her last 3 months for pre term labor. She wants me to call my dr tomorrow and let them know about this and my working and if they wanna see me in office. I guess what I'm getting at, is what should I ask the nurse specifically. I'm a first time mom, and super confused on all of this.