I would save your money and wait a bit. HPTs are expensive! Many women (maybe even most women?) haven't even released an egg as early as 14 days before their next period, so it would be almost the same as taking a pg test BEFORE you even had the sex that could have gotten you pregnant. See, for most women there is only about a 3 day window of time during which sex can make you pregnant.
(WARNING: I'm about to make a LOT of generalizations).
For women who have the typical 28-30 day cycles, that fertile window GENERALLY occurs right in the middle (10-14 days before your next period), maybe during days 15-17. This can vary for one woman from cycle to cycle. For me, I have cycles that are all over the place: 40 days, 50 days, 67 days, etc. I know that I always ovulate 13 days before my next period. So when we wanted to get pregnant I tracked my cycles and I knew that day 55 of my cycle was a good day for bd. I took a test 12 days after that sex, which was one day before my period was due.
Anyway, there is so much more to say about this than I know, so I really recommend you do some internet searches that explain how to determine your best time to get pregnant. If you read that sort of information, you may be able to piece together what is the optimal time for you to test. Please don't think I'm trying to be condescending, either. I mean, I thought I knew "how to get pregnant" (I mean, c'mon, we all know WHAT to do!), but then I started reading, and I realized I knew what to do, I just had NO IDEA of WHEN to do it. I hope this helps.