Some people have “false labor,” or Braxton-Hicks contractions. This can happen during your third trimester.
You can tell the difference between Braxton-Hicks contractions and “real” contractions because real contractions get closer together and stronger over time, but Braxton-Hicks contractions come and go.
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Sources: www.mothersadvocate.org, The Birth Partner by Penny Simkin with Katie Rohs. https://www.lamaze.org/parent-information