3 days late

Abbi
Okay so, my boyfriend and I are TTC. I calculated my fertile window and what not. We did the deed, I did the tww, and I am now 3 days late. And absolutely no sign af is on her way. Which is odd because I'm never late. But the thing is I only get my period for three days max. I don't know if I should test or not... Has anyone been in this position before?!