when to take a pregnancy test?

Kate
Hey guys, first time poster here and I'm going on 2 days being late.
In high school my period was always very irregular and was out on the pill to help regulate it and it didn't work. At 29 I got the implanting and didn't have a period for 5 years. I got it out in November and the last 4 months my body has been pretty consistent. 
My husband and I are kinda TTC. We haven't been super serious about it. So my main question, is how long should I wait before taking a pregnancy test?