Contractions and worried

Hello all,

Thank you for taking time to read my post. I am 23 weeks pregnant and for the last three days have been having contractions all day everyday. Only a few times have they been less than 10 minutes apart over the last three days. Most times they're averaging about 20-40 minutes apart. My doctor said not to worry unless they're 10 minutes or less apart or if I have a change in discharge. I'm so worried about this. Being on my feet makes it worse of course but I work as a nurse. Still if I lay around in bed all day I still get them all day. Has anyone else been experiencing or have experienced this??? I'm praying it gets better.