Period??

TMI IN ADVANCE LADIES :

So my period is supposed to come tomorrow. We are TTC currently. This afternoon I had very light pink blood and brown discharge. Now it’s more just bright red. It’s different than a period. Usually my first day I need a S+ tampon and its completely full. I had a R tampon in today and it was covered but not expanded. Like I said my period is usually intense and dark red so I’m curious if this is my period or maybe something else. (Was going to post a pic of my tampon but I feel like that’s crossing a line 😂)

all my test say negative; however I am only 11DPO. My cramping even feels different from a normal period. Usually it’s all in my back now all I feel is from my lower abdomen to just below my ribcage.

Thanks in advance for any advice!