Thanks for query.
You may get pregnant during your period also,reasons are-
1)sperm can survive in vagina for upto 5days,so if you have sex in period and if you ovulate as on 10thday chances of pregnancy
2)if you ovulate early(normally ovulate on 14th day of your cycle),as early as 10th day chances of pregnancy there.
3)ovulation bleeding,sometimes confuse with period,sex during this time leads to pregnancy.4)late period and early ovulation leads to pregnancy. take care.