I got my period when I was 12 and my periods were irregular until I was about the age of 18 or 19. I'm now 24. Just gave birth to my son. I got preggars on my first month of trying. I really don't think anyone can answer this person because everyone is different. A woman may be 19 years old with irregular periods or have cists or endometriosis, while a 25 year old may have no problems and gets preggars without trying. Or a 40 year old woman could fall prego without hardly trying and a 19 year old struggles because of the issue above.
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