Subscribe to our newsletter
3 weeks pregnant, or 1 week after conception: fertilisation
During fertilisation, a spermatozoon fertilises an oocyte in one of the fallopian tubes to form a single-cell entity called a zygote. This egg, containing 46 chromosomes (23 from the mother and 23 from the father), migrates to the uterine cavity and begins to divide to form a group of cells called a morula.
A small percentage of women experience implantation bleeding, a light bleed that happens about six to 12 days after conception. You may feel implantation cramps as well.
Related articles
Pregnancy week by week
41 weeks pregnant, or 39 weeks after conception: the possibility of an induction
Pregnancy week by week
40 weeks pregnant, or 38 weeks after conception: difficult to estimate the weight
Pregnancy week by week
39 weeks pregnant, or 37 weeks after conception: is my baby still active?
Pregnancy week by week
38 weeks pregnant, or 36 weeks after conception: waiting for labour to begin?
Pregnancy week by week
37 weeks pregnant, or 35 weeks after conception: the end of prematurity
Pregnancy week by week
36 weeks pregnant, or 34 weeks after conception: a baby with a new look