test it or rest it?

Em
Hey ladies! I'm kind of in an emotional crisis right now. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> told me I should be on my period on the 27th and it's currently the 30th- no period. When is it a good time to test? Should I be worried or test? Any help that anyone could give would be amazing- this is really tough for me 😣