Chart n ovulation

opal
Hey ladies some of u have given me advice on my chart and wat not just lookin for a bit more advice please so my fertility friend app says that i ovulated on the 26th jan and im 18dpo but my flo app it says i ovulated on the 31st which would make me only 13dpo now im thinking that the flo app is correct as my temps seem to be goin in the rite direction any advice would b nice thanks