I had my miscarriage in April. My baby didn't grow past 7 weeks and i miscarried at 10 weeks.
I was so devestated about my loss that during one of the bad points during the time i was actually miscarrying, i told my SO that i just couldn't do it anymore, and i didn't want to be pregnant again, in fear that i would just keep having miscarriages and would never have a baby.
At first we didn't want to TTC again until August or September. So we could be mentally prepared. After a long talk we decided to push it forward to June because we were both ready to TTC again, and just let things happen when they should happen. I got pregnant 3 months after we started TTC and on our first cycle charting, and we figured that we may not get pregnant straight away, so we'll just go with the flow.
We waited one cycle before we started again. I had my first period after the miscarriage in May and started after my period in June.
After speaking to my doctor before my period came, i asked him what the chances of me having another miscarriage was when i got pregnant again (I wanted to know because i had convinced myself that once you have one, your at a higher risk of having another), and he said that i had a 20% chance of a miscarriage, the same percent chance as those who are pregnant and have never had a miscarriage, so there is no added risk of a repeat miscarriage because you've already had one, thats what settled my fears alot, knowing that i had a 70% chance of a healthy pregnancy and the end result a healthy baby.

Maybe sit your fiance' down and talk to him about your fears of becoming pregnant again. What you are feeling is completely normal sweetie. Everyone has big fears after having a miscarriage. The pain of losing the baby, is so raw that you just never want to feel the pain you had to feel when you lost the baby. I know i never want to have to go through what i went through 2 months ago.