I don't know if im regular or irregular but I count 14 days after my period and had sex the 14 day I have to see my period on the 25 might be pregnant?

Maybe. Maybe not. If the 25th is when the next period is due, then we'll find out a few days after that. If the period is late by several days or more, one can check a urine pregnancy test. It should give a reliable result by the end of the month.