Doing unprotected sex during your periods does not lead to pregnancy
as that is the safest period when unprotected sex can't result in pregnancy.
Similarly chances of having pregnancy on eight day of starting periods looks very remote as that day constitutes app 6 to 7 days before your ovulation day.
For conception unprotected sex has to take place maximum 5 days befor ovulation and 1 day after ovulation.
In my opinion,chances of pregnancy are as good as nil.
However get your pregnancy test done,if you don't get periods on time.