First Week of Pregnancy
The first week of pregnancy is actually considered to be your menstrual period. Your due date is calculated from the very first day of your last period, this first week counts as part of your 40-week pregnancy although your baby hasn't been conceived yet. You won't actually be "pregnant" for the first two weeks of your pregnancy.
At the beginning of your cycle, about 20 eggs called ova begin to develop and take over fluid-filled sacs called follicles. One of these follicles then matures and breaks open, releasing an egg that will travel down the fallopian tube, where it will wait to be fertilized.
This all happens about 14 days before your cycle ends. An egg can be fertilized for only about 12 to 24 hours once the ovum is released. After this time the egg starts to disintigrate.
Don't be disappointed if you don't get pregnant right away. You only have about a 20% chance of getting pregnant during each month.
Goodbye Menstrual Cramps...
Hello Pregnancy Cramps!!
So, during this time your baby is in the making (in the maturing follicle), you just haven't concieved yet.