The patients in the intervention group will receive, in addition to the prenatal educational content, the 12 PNE lessons in audiovisual format. Each lesson will last between 10-15 minutes. The contents of PNE will be an adaptation, focused on the context of a pregnant woman, of the Butler & Moseley postulates. These contents have already been previously adapted according to the nature of the patients' pain, both in chronic pain and in acute pain. In summary, the participants will receive a detailed explanation about the biopsychosocial component of pain through the use of diagrams, metaphors and practical examples. In turn, the objectives of this program could be summarized as: (1) Reformulate erroneous beliefs about pain, (2) Inform about the biology and protective nature of pain and (3) Provide techniques to reduce kinesiophobia and, consequently, promote physical activity, with the beneficial effect it entails for patients with pain.

Patients assigned to the PE group will receive different content on standard PE based on the Pregnancy and Postpartum Clinical Practice Guide, consisting of general information about pregnancy (visits and monitoring of pregnancy, diet, phases of delivery, lactation, etc.), as well as specific recommendations for lumbopelvic pain associated with pregnancy. These contents will be developed by midwives from the participating hospitals. Participants will receive 12 educational sessions, with an estimated duration of 10 minutes each.

The patients in the intervention group will receive, in addition to the prenatal educational content, the 12 Pain neuroscience education lessons in audiovisual format. Each lesson will last between 10-15 minutes. The contents of PNE will be an adaptation, focused on the context of a pregnant woman, of the Butler & Moseley postulates. These contents have already been previously adapted according to the nature of the patients' pain, both in chronic pain and in acute pain. In summary, the participants will receive a detailed explanation about the biopsychosocial component of pain through the use of diagrams, metaphors and practical examples. In turn, the objectives of this program could be summarized as: (1) Reformulate erroneous beliefs about pain, (2) Inform about the biology and protective nature of pain and (3) Provide techniques to reduce kinesiophobia and, consequently, promote physical activity, with the beneficial effect it entails for patients with pain.

The Wijma Delivery Expectancy Questionnaire (W-DEQ) version A, validated in Spanish, has shown excellent psychometric properties. This instrument consists of 33 items scored from 1 to 6, with higher scores indicating greater fear of childbirth.

The pain catastrophizing scale is an instrument made up of 13 items (each item scores between 0 and 4), which measures the degree to which patients develop feelings and thoughts related to their nociceptive experience. This scale, which has a validated version for Spanish, shows adequate internal consistency.