To know if you are pregnant, the most common and reliable sign is a missed period. Early pregnancy may also cause symptoms like morning sickness (nausea and vomiting) , breast changes (tender, swollen, or larger breasts), feeling tired , frequent urination , and changes in appetite or mood. You can take a home pregnancy test which detects the pregnancy hormone (hCG) in your urine, usually accurate from the day of your expected period or even a few days before with sensitive tests. For confirmation and advice, consult a healthcare professional who may give you a urine or blood test.

Key early signs of pregnancy include:

• Missed period
• Nausea or morning sickness
• Tender, swollen, or sore breasts
• Feeling tired or fatigued
• Needing to urinate more often
• Mood changes and food cravings or aversions
• Possible light spotting or cramping around implantation time

Taking a pregnancy test after a missed period is the most straightforward way to confirm pregnancy, followed by a doctor's visit for further confirmation and prenatal care.