hello, thnx fr trusting HCM doctors fr ur health related queries.. i guess ur concern is-how to determine pregnancy??? usually after having protected sex if women gets pregnant her next month menses vil be missed..tis is normal protocol...but in ur case u have irregular periods....so u r getting confused, periods delayed cz of pregnany or cz of ur already existing irregular periods.... dont worry every problem has a solution,,, u can try out my suggestions:- 1.do urinary pregnancy test now itself...tis test kits ar availble at ur nearby medical stores at affordable prices...buy it,do it urself...if negative then u r not pregnant....if positive then ur pregnant...visit a nearby gynecologist for further help.. 2.i insist u visit gynecologist even if urine pregnancy test is negative...cz u said u have irregular periods problem,,so usually they ask to get scan(usg of abdomen n pelvis)to know the cause of ur irregular periods... n one more advantage of scan is - it tells whether a growing fetus/baby is there or not inside womb of women....u can freely discuss abt ur unprotected sex thing during visit,so u will have double advantage..(tis is not required if u already know wtz causing irregular periods n u already taking treatment fr it) 3.always use condoms..... 4.if forgot to use condoms or condoms rupture,,take i pill...but dont make it a habit.... i hope tis info was informative enough ,useful n helpful fr ur query.. regards:dr.sudha rani panagar... (first of al tis unprotected sex keeps bugging in mind among couples...besides tis u have irregular periods isssue,,,tat has doubled ur confusion,,,i can understand ur psychology....but dont take tension...every women goes through tis stage..)