So many days before your period is due

[WinkyWinkola]

can you use a bog standard pregnancy test with any accuracy?

...

depends on the test though
bog standard is usually 50 miu but some high st ones are 25
allegedly asda are 10

reliably??

3 maybe

So when does your body start producing hCG then? As soon as the cells begin to divide?

What's 50 miu? Sorry to be an ignoramus.

your body starts producing hcg as soon as fertilized egg implants.

miu is the amount of hcg present. ie 10mls is highly sensitive. 25 - 50 is about average for a hpt

Oh right, so only after implantation can hCG be detected?

So how long does it take for an egg to travel from the fallopian tube to the womb then?

7-10 days I think

yep 7-10 days.