how early should I test for pregnancy?

Jessica
Oh boy! I been feeling extremely tired lately. It's almost as if I were given a sleeping spell. Scared I could be pregnant, I had the iud.  (Skyla) for almost 3 years but it was causing me pains and bloating and removed in September. I'm pretty regular never late and I have been late 3 days so far no signs of period as of yet. So how early do you guys think I should wait to test?