Okay, I tried WBTB-ing again, now trying to have an inner conversation with myself, rather than counting or something. After a really long time of uncomfortableness, I felt something... My heart was beating so fast. And then it got even faster. However, I felt totally normal besides this. I thought this may be a sign of SP, as I heard some of other people had this SP sign. However, I haven't felt any numbness or similar.. Not even heaviness. Maybe that was only the start of the SP?

However, my darned eyes started opening, and I tried closing them, but they opened again. I wasn't controlling it! And a few second passed, the hard heartbeating fainted...

Now, I have some questions. Is this really a sign of SP or my heart just chose to beat fast? Why have I not felt other SP symptoms? Is it because this one may be the starting one, and then later I feel numb? Oh, and I never experienced anything of SP before, so I guess this is a step forward in my LD-ing career.