Supposedly pregnancy tests can only be done no more than about 3 days before your expected period. So if have regular cycles and can count 2 weeks post when you ovulated, or when your actual expected period is, then start testing a few days before that at the earliest. But sometimes you get a negative result and then need to test again a day or two later in case it's just too early rather than actual negative result. Good luck.
wow! that was fast response!! thank you so much for responding!!!
BFP's usually show up around 10 dpo.
I would think it would take at least 5-7 days afterwards to start producing enought HCG for a HPT to pick it up.