Spotting or a light period?

So I usually spot maybe 1 or 2 days before AF shows up. I have no had light spotting when I wipe since the 20th (4 days total). The color is usually very very light pink or very very dark brown. How we, I did have one wipe of spotting with red streaks in it yesterday. Only once. This morning there was just a small drop of more dark brown spotting on my liner but nothing when I wiped again. This is very unusual for me. I did POAS 2 days ago as I had been feeling a different kind of cramping (not fully blown AF cramps). The test was BFN. I fully expected that AF was going to show in full force yesterday after the red but nope. All throughout these 4 days (including this morning on day #5) I’ve been having a very sharp pain on the left side of my uterus. It comes and goes. I’m just wondering if anyone had any similar experiences and ended up getting their BFP later? Or is this just an oddly light AF? I’m so confused and frustrated!