2 days late

So I'm on day two of what's supposed to be my period. My period has been a tad off since I stopped taking birth control so I'm not sure if it's that or I'm pregnant. Kinda freaking out a little. I want kids and so does my fiancé but not right now. We want to be married first and enjoy that. Plus we're not financially ready either. Should I wait another day before I take a test? I've been very tired the last 2 weeks but that's normal for me. What should I do?