help?

Pls help po naguguluhan ako , kasi nung 1st ultra ko 22 weeks n s baby it means 5months n sya,diko sure yung binigay na date s lmp s doctor,pero kahit ba mali malalamn b talaga yan ng ultra kung ilang months na.naguguluhan LNG talaga ako eh,Iba2 ksi yung edd/edc ko April tska may naguguluhan ako kung alin yung totoo.