Implantation bleeding (clot)???

I’m about 10 dpo and yesterday afternoon I had some very mild and barely noticeable pinkish/brown spotting. That night I felt what would be the start of a period and noticed what amounted to several large drops of bright red blood and a clot. Today, almost remnants of that— bit of pink. I’ve had no cramps, but yesterday and the day before I had some mild back and hip pain. My breasts are still swollen and nipples sore. It’s been that way pretty much since ovulation. I’m worried that it’s a chemical pregnancy, but so far tests haven’t been positive for pregnancy.

Has anyone experienced this?? I’m trying to not freak out over here. I thought for sure I was pregnant and now I’m so confused.