If you have been trying to conceive for a year and your periods have recently become delayed by 3 months after being regular, it can feel worrying, but there are several possible and often treatable reasons. The first step is to rule out pregnancy with a test, even if it seems unlikely. If the test is negative, a common cause for missed or delayed periods is a hormone imbalance, which can happen due to stress, weight changes, thyroid problems, or conditions like Polycystic Ovary Syndrome. When hormones are not balanced, ovulation may not happen regularly, which can make it harder to conceive. It would be best to consult a gynaecologist, who may suggest simple blood tests and possibly an ultrasound to understand the cause. Treatment depends on the reason and may include medicines to regulate periods and support ovulation. In the meantime, try to maintain a healthy weight, eat a balanced diet, manage stress, and track your cycle. With proper evaluation and care, many couples are able to conceive successfully.