Had unprotected sex on September 19 and 20. My pediod came on 11 days later, could I still be pregnant. (during both times he didn't pull out)

Anytime penetration is involved, protected or not, pregnancy is a possibility. Wait to see if your next period comes. If it doesn't, then you may be in for a pregnancy test (with first morning urine) or a visit to your doctor.

Thanks