I wouldn't read anything into your temp at this early stage in your cycle. Fluctuations pre-ov are pretty normal.
As for the OPK, a faint line is a negative. The only positive on an OPK is when the Test line is darker or the same color as the Control line. You will almost always see two lines, because you always have
some LH in your system. You are trying to detect the
surge in LH, and that shows up by the Test line becoming darker or the same as the Control line.
Hope that helps!!