ended on the 10 this month had sex on the 13 and 17. risk?

If you did not use protection & he came inside you, then yes, you could be at risk for pregnancy... It is not all that likely, but you are usually fertile for 48hrs after your period ends. Of course, I know that almost anything can vary a little from person to person, so you could easily have been fertile for 3days, not just 2. If you are REALLY concerned & know you do NOT want to get pregnant, you could ask the health department about some kind of morning-after pill or such.