This is how it works for me usually. They will get darker day by day. Yours seems to get darker hour by hour so I would think that your getting close to your lh surge. What cd are you on, are you temping.
Good luck
I don't Hun but Deff looks like a bfp some tests are better at picking up hcg and different tests are better at different times try a frer or clear blue to put ur mind at ease but good luck post a pic up xxxxx