We didn't start trying for #2 until DD was about 4... I was charting an not ovulating so my IF testing started around the 6 month mark. (after charting for 6 months prior to TTC and then the 6 months while we were really trying and only ovulating twice) My longest cycle was around 117 days. My OBGYN said he generally waits the standard 12 months before testing/RE referral unless there is an underlying issue.
That being said... you do have a history, so touching base with your doctor can't hurt!
Sorry I'm not too helpful, but I wanted to wish you luck!