Implantation bleeding? 🩸

I started brown spotting 2 days ago. It was all brown then turned to pink today (maybe because sex last night) but there’s nothing on my underwear. It’s only when I wipe. When I push my fingers up a little further with the toilet paper, it’s like mucous and pinkish. Negative tests so far. Period due in 4-7 days (it’s irregular).