Thick,mud-like discharge BEFORE expected period?

My period is 2 days late so when I had cramping this morning I thought it was starting. So I put on a pad and forgot about it. Later in the day I went to pee and this is what I saw. Its normal for me to get brown discharge towards the end but never before my period, or if I do get brown discharge its very thin. Is it normal to have brown almost black discharge so thick it clumps up