An implantation bleed is another way to say subchorionic bleed - basically, you would have had a subchorionic hematoma but it bled out (which is good! you want the pressure off the sac) so it's a SCB. It's basically a slight placental abruption. Think of it like a paper cut. The skin under the paper cut is your uterus, and the flap is your placenta edge. As the sac grows on top of the placenta, it will put more pressure on the edge, like you would put pressure on a paper cut to help it heal. They probably will follow you if you have more bleeding, but one study I found showed that women with vaginal bleeding and no hematoma ended up with half the risk of those with a hematoma and no bleeding.
I would take it easy if you are still bleeding, or if you have any more bleeding episodes, until the bleeding stops again. Also, they say to keep well hydrated because dehydration can cause uterine contractions which can disturb the placenta and make it bleed more. I would also go on pelvic rest until the bleeding stops to not irritate it. I've had SCHs with 4 out of 5 pregnancies so far, so I've done some research on it, and that seems to be the consensus on how to best take care of them.
So all in all, yeah, if you had to have bleeding, you fall into the best category with the most positive prognosis

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