My regular period is every 25, 26, or 27 or before end of the month. I get unprotected sex day 14 and by morning before 12 hours, I take birth control pills 1 tablet. And in the next day,again I take 1 tablet. Today is date 29, it was 14 days past since I took that pills and still my period is not coming. It is possible I am pregnant or it is normal to be delayed my period, but I feel the pain in my breast now.

Both are possible... and its normal to have breast pain when a period is due or slightly overdue.

By birth control pills do you mean the morning after pill, or just regular birth control pills?

If it's regular birth control pills, they only work if taken regularly, they won't prevent pregnancy after you've already had sex.

If it's the morning after pill, it can throw off your period (read the pamplhlet that came with the pills, or go online to Google symptoms and side effects for that particular pill).

Is your period late? If it's at least a week late, try a pregnancy test using first morning urine. If that test is positive, you're pregnant. If it's negative, wait another week and test again. If that test is negative, wait until your next period is due, and if you miss it, go to your doctor for a blood test.

Good luck.