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I had 3 miscarriage before what my chance of an other ? - what is a miscarriage more condition_symptoms

Hello, I had 3 miscarriages, there are almost 3 years, but the 10th December, I discovered that I am 4 weeks pregnant but do not go to my first exploration in January, I am very worried because the baby might What can I do to make sure lose, I do not have my husband and I have tried for 2 years.
Can someone help me put to calm me?