Unwanted 72 and irregular periods.

Me and my boyfriend helped each other masturbating. Although the semen didn't come near me, but my boyfriend touched my panty after wiping his hands and then I wore it. It was a day before my ovulation day. Next day I had pain in lower abdomen so I thought there might be sperm transfer from his hands to panty and panty to me due to which I am having conception and to prevent it I took unwanted 72. 15 days after that, I started bleeding but the bleeding was sometimes less sometimes more. It stopped after 36 hrs and again started after 8 hrs which continued for 6 hrs and stopped for 8 hrs which then continued for another half hour. During second break, I took urine pregnancy test and it was negative. Now the bleeding is stopped but I have pain in my lower abdomen. My breasts aren't paining but I had vomiting today 2 times and I am having fever. I never had such irregular flow during periods. Could this be due to unwanted 72 i took days back or I could be pregnant?