I have irregular periods, but can still be pregnant?

okay I when i was younger i period was very normal but then I didn't have my period for a 2 years. so My doctor then gave me some birth control pills to balance my hormones this past April of 2006. I than got my period on the 1st- 7th of May. It was really heavy. And than on June i got it on the 1st-7th again. it was pretty normal. But I got my period again in June on the 15th-22nd once again it was normal. I stopped taking my pills mid june though. and my husband and I at that time were having unprotected sex about 6 times a week. until July 5 2006. and now I haven't gotten my period. I'm always feeling tired and i urinate more than i usually do and i get dizzy. so can I be pregnant? what r my chances of being pregnant?

yup just go check at the doctors