kal nyt ko gf ke sath sex kiya tha or 4 time sperm uske andr yoni me hi nikla tha. uski period date 18 june h. kya isme pregnet hone ke chance h ? suna h period ke 5-6 din phle pregnet hone ke chance bhut kam hote h. or kya kal sex krne ke bad aj hum home pregnency test kr skte h ? resut to sahi ho kregana plz help me