Should I test?

So my period is very very regular, but this cycle I am 3 days late. The most I’ve ever been late my entire life was half a day or 1 day. The only things I’m experiencing are moodiness ( a lot of agitation) and mild headaches they dont hurt enough to take anything but they’re uncomfortable and just there all day. I had a breast reduction last year and I have slight pain in my boobs but I don’t know if it’s sever enough to be pregnancy. I dont know if I should take a test or not because I’m thinking this may be a phantom pregnancy because I want a child so bad. What do you think I should do?