Is there such thing as implantation bleeding?

Yes. Yes. It is due to the placenta forming and establishing itself in the uterus. It does not mean that you are having a miscarriage. It is generally very light and short in duration.
Yes. Implantation bleeding occurs at the time that the early pregnancy "burrows" into the endometrium of the uterine wall. It usually occurs around 6-8 days after ovulation or cycle day 21 of a 28 day cycle. The amount and color of the bleeding are variable, but it is harmless. Progesterone levels should be +/- 20 ng/ml around this time of the cycle. In repeat miscarriage check Progesterone levels..

Related Questions

Is there really no such thing as implantation bleeding?

Really no, read on: If you follow HealthTap you'll see I have 100s of posts about implantation bleeding is not real. To explain: this is an older "garbage term" in general gynecology textbooks, means loosely "any unexplained bleeding in an early pregnancy." Fair enough, but women hope it means you can tell early (before a test or a period) you are pregnant if you have spotting. Not true, and I hope this helps. Read more...

Is there really a thing called implantation bleeding?

Yes. Embryo burrows into the decidua (lining of the uterus during early pregnancy) for implantation and the process can result in a slight bleeding. Read more...
Implantation Bleed. Implantation bleeding is real, typically a small amount of spotting 2 wks after fertilization (at the time of the missed menstrual period). The fertilized egg disrupts the decidua (vessels/fertile lining) of the uterus and causes a small bleed. Larger bleeds are more likely miscarriages, polyps, infection, or ectopic pregnancies. Read more...