Periods or implantation

My last period was from 23 dec. To 29 dec. I have average 28 day cycle.
22 Jan. night I had very mild brownish spotting.
23 Jan. Mild brownish spotting
24 Jan. No spotting
25 Jan. Morning two three reddish sticky threads.
No proper period yet.
What is it.
PS. I did pregnancy test on 21 Jan and it was negative.
The picture is of 23 Jan.
Please help me, what is it..period or pregnancy..
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