How long before you seek help when ttc baby no 2?

Hi everyone, I've been ttc baby no 2 for one year now and still no luck. It took almost 2 years to conceive out first, we sought some help but there seem to be no issues with either of us. We eventually conceived naturally but now all I seem to get is questions about when we are having another. Our daughter is now 2.5 years old and I didn't want a big age gap. Not sure when to try and seek help. 
Thanks for any thoughts or stories that could help. 

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