Hi,AAkansha,thanks for query.Please go for "TORCH" testing,this test detectes infection againest rubella,toxoplasmosis
and chlamydia.This are the commoest infection responsible for most of the abortion.At least you must take rubella vaccine
before planning for pregnancy
this time.There also chances of some hormonal deficiency
in early stages when ever placenta in not producing sufficient hormones.Please discuss this issue with your doctor,you should also take one more opinion from other gynec for this.
wishing you all the best.