Just Irregular or Time to Test?

Crystal
I went on the pill about 3 years after I started getting my period, and have taken it religiously for the last 14 years. I had only switched prescriptions once, (many years back) it was just to the generic brand, but they were both a "low dose" pill. My period has been regular for the majority of that time, running on an average 28 day cycle and lasting from day 25 to day 28. 
My husband and I have decided that we are ready to conceive and I finished my last pack about 2 months ago. After the first month of being off the pill my period was a little off timing wise. Started spotting D26, actually started D27 and lasted till D29. Fast forward to month 2 and it's running even later. Based on a 28 day cycle and when I would normally start, it's now day 27, and I'm not even spotting. 
I understand that it is normal to be irregular after coming off the pill. But with having an irregular cycle, at what point does it make sense to take a test? 
Thanks in advance.