6 weeks pregnant after a loss.

 I am now 6 weeks pregnant after a m/c at 6 weeks in August. I am super nervous that I will again miscarry. My last m/c was awful, because I went in at what I thought was 8 weeks and was told I was only about 5 weeks. Then two weeks later was told my baby had no hb. No signs of a miscarriage at all. My body wouldn't miscarry on its own, so I did medical management. (never again). I have a 2 year old little boy and that pregnancy went very smoothly. I have only had one m/c. Has anyone experienced a loss and went on to have a perfectly healthy pregnancy? I am assuming being so nervous is natural?