Help!!

I’ve been having this type of bleeding/spotting since yesterday. Yesterday it was a darker red mixed with EWCM and today it has been like a brownish and VERY light. Almost not even there. Now I used the bathroom and wiped and had this mixed with watery CM 😩😩😩 I’ve heard it’s too dark to be implantation and it’s my period. I’ve had cramps and pressure in my ovaries and uterus but not like my period cramps. I’m on CD 18 and idk what to do or think. I took a pregnancy test and it was negative but it can be super early as I am anywhere between 3-6 DPO. It’s been such a weird and crazy cycle for me. Please help.