Best pregnancy test for maybe being a few weeks along?!

What is the best type of pregnancy test to take if you think you are very early in a pregnancy? I had sex the week of late June and early July and have been feeling sick. My birth control makes me not have periods so that’s not a big help. I would only be a couple of weeks along if I indeed was, but what test would be sure to pick it up? I had already taken a test but it was the faintest line and many people are saying it’s positive or an evap...and I just want to make sure.