The chances of pregnancy
looks very remote because of two reasons.
1.. The last unprotected sex was just before your due date,which is a safe period for the sex.4 to 5 days prior to the periods and immediately after periods are termed as safe periods during which contraception
takes place very rarely.
2... You had bleeding,although for small period,during your periods.
I advise you to wait and watch and wait for your due date.