When should I start antenatal?

I'm curious about the timing for starting antenatal care. When is the ideal moment to begin this important process? Are there specific milestones or stages in pregnancy that make it more crucial to start antenatal? I understand that it's essential for both mother and baby's health, but I'd like to know if there's a recommended period or if it's more flexible. Is there anything I should consider before making the decision to start antenatal, or is it something that should be done as soon as possible after confirming pregnancy?