Hi Megsmum so sorry to hear of your losses... :hugs:

Implantation *generally* happens between 5-8dpo with day 5 being the average - so *they* say! It takes a good 36 hours for hcg to be detectable in your urine after that (obviously it's detectable in your blood earlier). So, you can see it will depend on when implantation occurs for you.

Using 10miu tests I have had a feint but clear positive at 8dpo. This is early though so keep that in mind... I then got a darker result at 9dpo and a very dark result at 10dpo.

I would suggest for accuracy purposes that you wait until you are 10dpo.
Wishing you a for this month! PLease let us know how you go...