Hcg low - miscarriage

Vanu • Mother to a lovely baby girl 💗
My hcg levels were 202 at week 4. I had another test after 3 days and the levels were 325. Today they did another test which is after a week and the levels are now 245. My doctor asked me to prepare myself for miscarriage. :( it was too good to be true, Got pregnant in just two months of ttc. Has anyone else gone through natural miscarriage, any advice will be helpful?