I had unprotected sex on 7/16 and 7/17 my cycle was due on 8/4 im 2 days late should i worrie?

Pregnancy test...: You may be pregnant but you won't know until you take a test. I would suggest that worrying about it isn't going to change anything - take the test and know. If it is negative and you don't get your period in the next week, repeat the test and make an appointment to see your gyn to investigate other causes for menstrual irregularities.