Welcome! How can I help with your medical...

Welcome! How can I help with your medical question? Hello Doc,goodmorning..im jenny 28 y.o..i just have this situation.. my monthly period is started last april 24 and ended at april 29..but my menstration is not constant like every 24th of the month i have my period..sometimes it came 1st week of the month..sometimes in the middle of the month and sometimes lastweek or last day of the month and i am having always a dysmenorrhea ..i didnt take any birth control pills..the situation was i had coitus with my partner last may 12 but he used condom..bit im paranoid thats why i asked my friend what to do?she gave me 2 pills(dianne 35)and i took it within 12 hrs..then last may 19 we had unprotected sex..but he told me he didnt let inside in..or cum inside..but still im more paranoid after 15 mins i take again same pills 2 pills..then tomorrow i take again 2 pills..and the last coitus we has is may 27..and i have bleeding..but he used condom..until now i didnt get my period..but i feel some back pain and lower abdominal pain..and breast tenderness..my question Doctor is..i am pregnant or this is just premenstrual??? Have you seen a doctor about this yet? What medications are you taking? Not yet.i just take ordinary pills,vitamin c..and teas Anything else in your medical history you think the doctor should know? Am just had an asthma when i was a baby but am okay now