roughly 10 days from conception to implant. Once implanted then hcg is released and can test positive. I think it implants for a good while, hence why some women can get a 3 day bleed. theres a good set of videos to watch in the sticky top section explains it all with real videos!
I did read one interesting thing in my new book, even though millions of sperm are released only around 200 will make it to the tube and survive! And from getting from the ''vanjita'' to the tube is the equivelant of hundreds of miles for them and takes 48 hours! Just a bit of useless info for you there!