Myself Rama.i Had A Problem Of Irregular Periods.it Is Come

Myself rama.i had a problem of irregular periods.it is come by 3,4 days diffrence to the period date.my last mensual period 5th july.am participate sex with my partner on 22nd august.during esaculation he pullout.eventhough am worried about it. Is it may confirm pregnancy. If it is yes then what are the remidies medicine for avoid pregnancy.please tell me