Numbers really don’t matter??

Er

Is it true that as long as your HCG doubles it doesn’t matter what you start at? I know I ovulated late so I’m not 5 weeks based off my lmp. I had blood work done Thursday afternoon and it was 5, went back this morning for bloodwork and it was 12. More than doubled in less than 48hours. Doing more bloodwork next week but dr said I am 1-2 weeks pregnant. AF is now 4 days late. Can I still be hopeful? No bleeding or cramping.....thanks for your help.