2 weeks.
basically.

There is a fertile window of about a week each month, and it's the week before ovulation. This window ends at ovulation. Once you've ovulated you enter the luteal phase and it's then too late for fertilization to occur as the sperm has to travel to reach the egg.

Implantation takes place normally about 6-10 days post-ovulation. HCG levels then start rising and that's what a pregancy test picks up. Usually at the time when your period is due. Sensitive pregnancy tests can pick up HCG a few days earlier than the date your period is due.

/pubic health announcement
( crackhouseceilidhband Fuck off back to Mumsnet, Fri 19 Jun 2009, 15:12, 2 replies, latest was 16 years ago)

At what point do you have to check under the gooseberry bush?

( Colonel Dracula Two manky hookers and a racist dwarf, Fri 19 Jun 2009, 15:23, Reply)

when you're making crumble

( crackhouseceilidhband Fuck off back to Mumsnet, Fri 19 Jun 2009, 15:31, Reply)

sometimes I make crumble on my own
and I do that pre-crum thing.
(happylittletulip helpless and delicious, Fri 19 Jun 2009, 15:39, Reply)

hahaha.
*never eats crumble again*
( crackhouseceilidhband Fuck off back to Mumsnet, Fri 19 Jun 2009, 15:44, Reply)

CHCB
You are a star. Just the anwser I was looking for.

I might run a book or something.
( Noeli overtheshoulderboulderholderthingstraplatchboobs, Fri 19 Jun 2009, 15:43, Reply)