pregnant again??

So I'm freaking out. I use eve 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.