14 days after sex is the earliest you usually can get a result. It takes a week for the baby to implant then another week for hormone levels to be high enough to detect.
I got my positive 10 days after Ovulation. If you get the early preg tests they can test up to 5 days before your period is due...however it is most accurate if you wait until at least the day you are due. I was doing all the early testing because we had been trying to conceive for 7 months.
I got my first positive 9 days before my period was due. I took another it was negative took two more positive and then had my blood drawn and it was positive so it depends on how high your hcg levels are. I too tested early due to ttc for 4yrs. I had reoccuring m/cs. Good luck.
I got a positive 11 DPO, four days before my period was due. I use First Response Early Result. The digital ones aren't as sensitive, and the blue dye ones seem to give false positives or have "ghost lines".
Ps if you go to pee on a stick .com it gives you a list of the different brands and what their tests require for a pos hpt! So that should help you too!
AP
I got a BFN 11 dpo and a BFP on 17 dpo so I think the longer you wait, the better. (I didn't test in between those dates so I might have gotten a BFP sooner)