Last period was 28sept, fertile days was 10-13 october ,had unprotected sex on the 10th,i'm due my period the 26th october should i take a test ?

Pregnancy testing: Too early to be positive . Wait till Oct 27th then blood test may be positive , urine positive later. Blood HCG detects 2-3 days after implantation, levels for urine HCG are higher so detects a few days later. For 28 day cycle ovulate on day 14, get fertilized on 15 , 5 days to implantation and 2-3 d till positive ,so 15+5+3= Oct 23, the earliest for blood, but may be a bit later.