Should I get a second opinion?

I was told at 3 and a half weeks by my gyn that I’m miscarrying because I was bleeding like a period for about 5 days total and my hcg was only at 19. I’m now 4(ish) weeks and the bleeding stopped. decided to test one last time yesterday to see if my second line was starting to fade at all. It wasn’t. It was the darkest line I’ve gotten out of all my tests. The same color as the control line. Do you think I should get a second opinion on this “miscarriage”? My next appointment for a blood draw isn’t for 3 more days and they scheduled it so far out from the first blood draw because they were SURE I was miscarrying and wanted to know that my hcg was dropping. I just have this feeling that they’re wrong. Someone please give me some insight.