This paper is concerned with addressing the complex impact of the therapist's pregnancy on the analytic treatment process. The pregnancy is seen as intensifying the transference and countertransference material so that the therapeutic work becomes more strenuous as well as more fluid, with the potential for significant therapeutic change. The paper is divided into two parts. The first section attempts to conceptualise the meaning of the experience for the therapist and patient within the framework of psychoanalytic theory. Problems of technique and management resulting from the pregnancy are examined. One of the issues considered is the manner and timing of the patient's recognition of the pregnancy. The second section of the paper contains extensive clinical material illustrating the enriched transference and countertransference processes, and the access these allow to psychotic pockets of the personality, hitherto largely unavailable for exploration.