Threatened miscarriage

Hello ladies,

So I found out last week I was pregnant so today I would be around 4-5 weeks. So the next day after my bfp I started spotting. So I went to get my hcg tested first test was 403 and 48 hours later my hcg was 460 and progesterone was low as well. Now I’m barley spotting only brown and I still feel pregnant. I’m just so hurt and confused. The doctor doesn’t think there is any hope. Has this happened to anyone and the pregnancy continued or should I just give up. We have been ttc for 2 years.