Not sure if its the same from person to person but I have 2 children and with my first son I didnt bleed in the pregnancy at all but with my second I woke up one morning to find I was bleeding alittle I was 13wks pregnant and really paranoid that I was beginning to miscarry but it stopped and the midwfe told me it was probably implantation bleeding. I went on to have a healthy pregnancy and now have a 18mth old toddler!