as you got periods after miscarriage
and the scan confirmed that there are no signs of pregnancy
, the possibility of pregnancy is almost ruled out,
feeling of being pregnant in absence of pregnancy is called spurious pregnancy, that can be seen in case of intense desire to have children,
anyhow you take treatment for pelvic infection
now, then after that you trace ovulation with kits or by ultrasound
and plan intercourse around that period which will increase the possibility of pregnancy, this time try to avoid the factors which led to abortion.