You have H/O previous miscarriage
in July and ultrasound scan for pelvis is WNL.
There are several reasons of miscarriage and have to rule out like Blood gr & Rh typing of both of you, chromosomal/ genetic abnormality, LPD/ Progesterone deficiency
, Intrauterine infection, Diabetes, thyroid dysfunction
Consult with your gynecologist for complete evaluation of miscarriage and do the needful tests.
Take Folic acid
and other nutrients in pre-conceptional period to 3 months of pregnancy, avoid heavy work or long journey,complete bed rest and take healthy diet rich in protein during early months.