Any advice from y’all would help

Nikki

In the pictures you see my cycle!! Last time I had sex December 31st and January 1st both days unprotected!! But I don’t know if my cycle 26 days or 28 days!! Every thing I went on trying to add it up!! The main thing I know is that they all telling me I’m due for my period on the 15th r the 16th!! Please help!! Yes I’m trying to get pregnant!!