I Have Had A Few Sexual Encounters With People And

I have had a few sexual encounters with people and never really had been tested, some with condoms and some without. But usually never allowed the ones that didn't have condoms on to finish. (younger college days). Anyways, just went and got Oraquick today and swapped my gums more than was asked (twice instead of once on both sides). Placed the stick in the tube and it became pink with a faint 20% line on the T with full Controll line bright pink initially, but once it got closer to 20 min mark the T line began to disappear and completely vanished by 30 min. I was kinda freaked out by the faint T line that appeared in the beginning so I went and got another Oraquick and took it immediately. (might have had a sip of gaterode 10 min prior) but swipped my gums like instructed just once and placed it in the tube and it came back completely Negative. I guess I'm just really concerned and hoping to find answers or people with same circumstances.
so
1) Is there any reason that the T line would show up minorly in the beginning and than disappear to a grey smudge by the 25min result? Am I positive?
2) Did I perform the next test too soon after (1 hour)?
3) Do ya'll think I'm positive? Please help me!
Taylor