I had sex about 12 days ago.

2 days ago, I started spotting brownish blood (not even enough to fill a liner, and btw, this has never happened before). Then, this morning, I began to bleed heavier with some mild cramping for a while (a couple hours). Now my bleeding has dwindled to light bleeding every now and then. I would like to know if you think this is deciduous bleeding (bc I had only a few clumps with light bleeding). I have had a continuous higher temperature for about 3 days now and have had headaches, constipation, and a loss of appetite.

I would just like to know if anyone else has experienced this with their pregnancy. Thanx!