From ovulation it takes about a week for the fertilized egg to travel the tubes to the uterus. Another week or so to implant itself in the uterus and another six days to form the placenta which then has to start functioning and putting out the hcg hormone. The hormone will be picked up in the urine about a week after that or around the time your next period should start. Which is why they say to actually miss your cycle before you test.
at 10:40 AM on Sep. 21, 2009