Pregnant or paranoid?

Howdy! Before I begin, I think I need to also mention that I am VERY aware of my cycle. I am incredibly regular, monitor my bbt, check my CM, and am all-around pretty informed on my goods.

Looking for someone who can set me straight in my baby fever.

I experienced the slightest spotting 6 days after ovulation with maybe cramps? I’m usually very good at detecting my cramps, but I can’t tell if I was just putting the idea in my own head.

Period is supposed to start in 5 days and my CM is heavy, whereas it’s usually pretty dry and nonexistent around my period.

Last point is that my breasts are starting to look more veiny than normal, especially around my areolas. Some darker veins are also present at the front of my hips around where underwear sit.

Took a first response test today (second pee of the day) and it came back negative.

I’m feeling about 80% sure I’m pregnant, but am I just putting the idea in my own head??