Inclusion Criteria:  Women from the age of 18 up to the age of 40 who have consented to hysteroscopy investigation as part of their standard NHS care. Women who have had an ultrasound scan, within the preceding 5 years, demonstrating a normal uterine cavity with no gross anatomical abnormalities (e.g. uterine septum). Women who have given informed consented to take part in the study  Exclusion Criteria:  Inability to tolerate vaginal examinations Women who are pregnant Women who do not have regular menstrual cycles Women who have not given consent to the study.