I Have An Irregular Period, Usually 3 Months Or More

I have an irregular period, usually 3 months or more before i have the next period. I had sex on the month of july and took emergency contraception the next day. I took 4 pills after 12 hrs i took another 4 pills. After 3or 4 hours i vomitt. After a week or two weeks i had my period and last for 4 or 5 days like my normal period. Since then i havent got my period yet. Am i pregnant?