What could this be?

Update: Went down to the KKH and did another blood test. Doctor said it seems like a biochemical pregnancy. Blood test results shows that my hcg levels has gone down. From 49.8 to 31.4. She mentioned that hcg by right should drop down by half. But she didn’t specifically said it was a miscarriage… she just briefly said that it is most likely to be a biochemical pregnancy. And that another blood test is required to monitor hcg levels. I asked her if I’m still pregnant - she said yes but couldn’t detect anything from scan. But if the upcoming hcg level is still not dropping. It might be an ectopic pregnancy. She also mentioned that it’s not gonna be a healthy pregnancy if indeed hcg level is still above 25. So, I’m just like - did I just experienced miscarriage? Am I still pregnant and expecting a child? I don’t know. I don’t know how to feel sad.