which one do I go by

Charlese • Second time mom due In June
Due to two <a href="https://play.google.com/store/apps/details?id=com.glow.android.baby">baby apps</a> telling me two different weeks one says 27 one says 26 I googled how far am I really and it says I conceived March 24th which sounds right and I am 26 weeks and 3 days my lmp was March 13th