The most fertile window is the five days leading up to ovulation and the day of ovulation itself. In a typical 28-day cycle, ovulation usually occurs around day 14. To track this, urine-based ovulation predictor kits that detect the luteinizing hormone (LH) surge are highly effective and simple to use. Regarding supplements, taking a daily prenatal vitamin containing at least 400 mcg of folic acid is highly recommended to support healthy fetal development. Other supplements like Vitamin D, Omega-3 fatty acids, and Coenzyme Q10 can also support fertility. I recommend consulting your doctor to create a personalized plan.