Hi
I didn't have a retroplacental clot (which means the clot is completely behind the placenta) but I did have a clot at the edge of the placenta (ie partially behind). It terrified me form 8 weeks until 16 weeks. I had to ban myself from the internet because of all the disaster stories. My OB told me that they mostly fix themselves prior to 20 weeks. Sure enough, mine did and I'm now 21 weeks and all is going well.