Delivering early

Melinda • Loving wife and mother of 2 and 1 on the way...Expecting baby girl Elysia (Elly) Joy...Due date April 17, 2016...
So with my daughter I was two weeks early. With my son I was three weeks early and now I'm pregnant with my third. Do you think there is a chance of me delivering possibly 4 weeks early with this pregnancy? Because some people say if you deliver early with one pregnancy the next pregnancy you can deliver earlier... and so far that's happened with my two previous pregnancies so I'm a little nervous about this one.