Bleeding at 7 weeks

I just wanted to share what happened to me recently since I'd never heard of it before. At 7 and a half weeks, I had some bleeding, maybe about a teaspoon or two, no cramps. I was really worried and called the doctor. They ended up having me go in for an ultrasound at 8 weeks and everything was perfectly fine with the baby. The ultrasound tech showed me a spot on the screen and said that was the cause of the blood, that I had an implantation bleed and that there was a small pocket of blood was in the uterus and it either finds it's way out or gets re-absorbed. So it's possible to have implantation bleeding appear at 7 weeks! I always thought that it would show up right when the implantation happens, a week or so post ovulation, or not at all.