trying again after miscarriage in May

  My husband and I found out we were pregnant early April with our first baby and we're so excited. By my second follow up appointment on may 5 we found out the baby had stopped growing and there was no longer a heart beat between weeks 7-9. We were so disappointed. I had a D&C on May 11 and I am still testing positive for hcg but as of last week on 6-15 I was down to 15. I am hopeful this weeks blood tests comes out 0 so I can start trying again. However I am very nervous this will happen again. How is everyone else getting through all this and processing it all? Anyone else having trouble getting hcg down? Thoughts, ideas, suggestions are Greatly  appreciated.