Dear sticks and stones,
It is very nice that you are pregnant again. It is also very understandable that you are a bit worried. As you must know, the first three months of a pregnancy are the most tricky ones. In previous years it used to be said you should not tell anybody about your pregnancy until those three months had passed. That is for exactly the reason that you can have a miscarriage. Of course you can be happy, but there is always a risk of miscarriage.
I recently read this article that said that the risk of another miscarriage if you are pregnant again within six months of losing a baby is lower. You have a better chance of not having a miscarriage than other women, in other words.
So I bet you will be lucky this time. It happened to me too, once. I was 10 weeks pregnant and it was my first pregnancy. I only went on to get pregnant once more after that, but that pregnancy is now my daughter. She is in college!
I wish you the most wonderful pregnancy and a lovely cuddly baby to hold in your arms.