Hi Stacy. I'll try to give you a simple answer to this, along with a couple of links if I have room for them.
First of all, conception occurs as a result of BDing BEFORE you ovulate, not AFTER you ovulate. Ovulation is a one-day event which occurs as the third part of a four-part menstrual cycle which begins with your period. You have to BD during your follicular phase (the second phase of your cycle) in order to become pregnant. If you were expecting your period on the 7th, then you should have been in the luteal phase of your cycle by that point, and should have been unable to become pregnant.
So the simple answer is that you're probably NOT pregnant.
However, because the follicular phase of the cycle is variable (can differ in length), and you haven't had your period, there is a small possibility that you hadn't ovulated yet when you BD'ed, and therefore a small possibility that you COULD be pregnant.
That being said, you tested too early.
Pregnancy occurs when the fertilized egg (embryo) implants on the uterine wall (which is normally shed during a period). This occurs TEN DAYS AFTER YOU OVULATE. Therefore, if you BD'ed on the sixth, we'd have to assume that at the earliest you ovulated on the seventh, the very earliest you would begin producing pregnancy hormones would be the 17th, which is today.
Tests won't be accurate until about two days after that, and even so, they may not be accurate for a full fourteen days after ovulation. Assuming you ovulated on the 7th, that would mean that you'd have to wait until the twenty-first to test with accurate results from a pregnancy test.
So, wait another four days, test again, and you should have your answer, if your period hasn't shown up by then.
Here are those links: