What app is correct!!?

Cheyenne

Probably the most stupidest question on earth but I have this app and then the ovia app and this one says I'm 26 weeks and 5 days, my ovia app says I 26 weeks and 4days, I know for a lot of people they are like no big deal but to me it kind of aggravates me and I want the most accurate one. I'm due October 18th 2017.