.my.period was april 22-25/26 and i had unprotected sex 7 days later may 2 2013 is there a chance i could be pregnant & how will i know to take a test
Yes, there is a chance. You had sex on day 10 of your cycle. Normally you'll ovulate between about days 11 and 16. Sperm can remain viable for about 5 days too.
Wait at least two weeks, preferably three, from when you had sex to test. Use only your first morning urine (wakeup pee) when testing for the best accuracy.
False negatives are common testing early so if you don't have your period on time, retest.