We had unprotected sex two days before my periods was supposed to come. now my periods is almost 2 and half weeks late.no symptoms at all, am i preg?

Maybe not, but...: Check a urine preg. Test. Pregnancy is the most common cause of a missed period. If not pregnant, other causes of a late or missed period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… one can visit her ob-gyn doctor if symptoms are persistent or worrisome.