Period app right or am I late?

My last period was December 17-20th. I have three different apps. Two say I ovulated December 29th-January 4th. Which would make me suppose to start yesterday or today. But another app said I ovulated January 5-11th so I won’t start till the 24th. All my apps have the same data put in since August. I dont know what to take it as. I’m hoping I am and I’ll be crushed to see the one app is right.

Since I didn’t start two day it pushed my period out to the 17th instead of today like I had said.