The due date is based on what you keyed in and it does not work the same for everyone. Your EDD will change according to baby’s size during every scan and when you’re gonna give birth also depends on your condition (if inducing is needed) and also when baby wants to come out. However do note that TAP’s app dates seems to always go off by a day or two. So I’d advice not to stress yourself too much over the dates. Take a pregnancy test……?