In your case it's better to investigate first for causes of recurrent pregnancy loss once cause found then starting treatment at least three month prior  to planning pregnancy will be helpful

You should be properly evaluated before planning next pregnancy

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More details on how many months of pregnancy was a miscarriage happened is need to be evaluated the basic is basic both the partners have to take prenatal vitamins at least three months prior to trying to plan for conceiving once conceived you should confirm the Urine Pregnancy test immediately after the postmortem of your periods and then visit a doctor immediately for transvaginal ultrasound scan to find out the location of pregnancy and if it is located in the uterus you have to be supported with certain medicines which increases the blood supply and make sure that there is no miscarriage again Apart from that you have to be done some test called APLA Or TORCH screening which will tell you whether certain injections has to be given right from the beginning of a pregnancy to have a healthy pregnancy You are also considered to be an high risk pregnancy with recurrent pregnancy loss and you need frequent follow with proper scans like NT scan and anomalies