Hello, If you have irregular periods, it can be difficult to determine when you are ovulating and when you are most likely to conceive. However, there are a few ways to confirm pregnancy. The most common way to confirm pregnancy is to take a home pregnancy test. The hormone human chorionic gonadotropin (hCG) is detected in your urine in these tests. This hormone is produced by the placenta after a fertilized egg implants in the uterus. Home pregnancy tests are very accurate and can detect pregnancy as early as a few days after a missed period. If you have irregular periods, it may be difficult to determine when you should take a pregnancy test. I would recommend waiting until at least two weeks after you have had sex to take a test. This will give your body enough time to produce hCG if you are pregnant. In addition to a home pregnancy test, you can also schedule an appointment with your doctor for a blood test. This test can detect pregnancy earlier than a home pregnancy test and can also measure the level of hCG in your blood. Regarding your symptoms, sore breasts, fatigue, and an increase in sex drive can be early signs of pregnancy, but they can also be caused by other factors such as stress. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nikhil Aggarwal, General & Family Physician