Treatment With Repetitive Transcranial Magnetic Stimulation in Peripartal Depression

The goal of this clinical trial is to learn whether repetitive transcranial magnetic stimulation (rTMS) can reduce depressive symptoms in women who are pregnant or up to 12 months after childbirth and have peripartum depression. rTMS is a non-invasive treatment in which a device placed on the scalp delivers gentle magnetic pulses to a brain area involved in mood regulation. It does not involve medication or anaesthesia. The main questions this study aims to answer are: * Does active rTMS reduce depressive symptoms more than sham rTMS? * What side effects occur during treatment, and how well is rTMS tolerated? * Are improvements in depressive symptoms still present one month after treatment? Researchers will compare active rTMS with sham rTMS, a treatment designed to feel and sound similar but not to provide effective brain stimulation. Neither participants nor the clinicians assessing depressive symptoms will know which treatment was assigned during the main study phase. Up to 60 women aged 18 years or older who are pregnant or up to 12 months after childbirth and have clinically relevant depressive symptoms may take part. Participants will: * Attend a screening and baseline visit, including questionnaires, EEG and ECG recordings, and collection of small hair and sputum samples to study stress-related hormone levels * Be assigned by chance to receive either active rTMS or sham rTMS * Attend 30 treatment sessions, scheduled flexibly over approximately 1.5 to 10 weeks to accommodate childcare, breastfeeding, fatigue, and medical appointments * Complete questionnaires about mood, wellbeing, quality of life, social support, and treatment expectations before and after treatment * Have safety and side effects checked before each treatment session * Complete a telephone follow-up assessment one month after treatment * Be asked to complete a short questionnaire about their child's development one year after treatment Each treatment visit lasts about 30 minutes, includ