Quantum Menstrual Health Monitoring Study

This study is monitoring menstrual cycles and ovulation in detail using ultrasound and wearable sensors, including a "quantum" monitoring device, in regularly cycling women, women with PCOS (polycystic ovary syndrome), and female athletes. The goal is to understand how cycle tracking technologies perform across different groups. **You may be eligible if...** - You are aged 18–45 and regularly menstruating, have PCOS, or are a female athlete - Your cycle lengths are 24–34 days and you know your last 3 cycle lengths - You test negative for pregnancy at the start and end of each study cycle - You are able to travel to a clinic in Calgary for regular ultrasound appointments **You may NOT be eligible if...** - You have not been ovulating in your last 3 cycles - You are currently on medications that affect ovulation (such as oral contraceptives or ovulation stimulants) - You have conditions affecting fertility (such as endometriosis, pelvic inflammatory disease in the past year, or pituitary problems) - You are trying to get pregnant during the study Talk to your doctor to see if this trial is right for you.