abnormally light period

my boyfriend and i had sex and the condom broke. i started my period about 10 days early (although, this happens to me a lot) and at first it was extremely heavy with cramps. then it become very light but i have been bleeding for about a day or two. i am 20 years old, and not on birth control. i havent really had any other symptoms of pregnancy. do you think i oculd be pregnant?