3 days late & 1 negative pregnancy test?

I am 3 almost 4 days late for my period & I took a pregnancy test & it came back negative. My husband & I did the do on one of my fertile days.. I've been using this app since December & it has been spot on with the day my period starts. Should I wait another 3-4 days to see if my period shows up & if not take a test again, or what? I'm not unfamiliar with being pregnant, I have an almost 2 year old & i tested after o was 3 days late with him & got my positive pregnancy result! Any tips, or advice. Thanks in advance.