pregnant again??

So I'm freaking out. I use <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> for tracking my period and it's so spot on it's almost freaky. I'm three days late and I'm working myself up. I'm not sure if I'm just stressing out a lot and it's delaying it. Or if I am pregnant. I also have Paragard, but I've read that there are quite a few women who have gotten pregnant with it. Ugh what do I do. I already have a 16 month old.