In my practice, every pregnancy is precious, and so even after one miscarriage we can arrange tests to exclude any factor that would increase the risk of a further pregnancy loss.
Certainly once a woman has had more than two miscarriages, these investigations should always be done and include blood tests for genetic, immune, hormonal and clotting issues, an ultrasound scan to investigate the womb itself and the cervix, and in some cases a genetic blood test for the man and a sperm test.
Couples who experience repeated miscarriages that are the result of genetic problems sometimes opt for a special form of IVF treatment called PGS or PGD, where the embryo is genetically tested before it is implanted, even though getting pregnant is not the issue.
Other treatments might include hormonal support, medications to alter the immune response or clotting response to a new pregnancy, or surgery.
Any new pregnancy is supported and monitored from the very beginning with blood tests and scans, and emotional support.