Implantation bleeding

Hi everyone this is my first pregnancy and I did not know I was pregnant until I started to have implantation bleeding I took two pregnancy test and they all came back positive also I have been doing blood test and there is signs of hCG my levels are only at 34.6 I am concerned about The bleeding the blood is not red it is more like pink and brown it bled for four days and now it has stopped has anyone ever experienced this and went on to carry a healthy pregnancy