Misdiagnosed Miscarriage?

Long story short, 3 weeks ago, I found out I was pregnant. Due to a previous miscarriage, I was getting bloodwork done every other day to make sure my HCG levels were rising. The 3rd time I got lap work done, my levels only raised a point instead of doubling so my OB told me to stop taking progesterone because she said I was having a chemical miscarriage. Did that, and I bled for 3 days. Fast forward to last Sunday, I took a pregnancy test and there was a faint but noticeable line, didn’t think much of it. Then tonight, I took another pregnancy test because I just haven’t felt right, and my test came out darker than it’s ever been right when I peed on it.

Could this be a misdiagnosed miscarriage?