Hcg levels at 4 weeks?

Candace • Just made my rainbow 🌈 👶👼🏼

My levels are 1,570.00. I know they base it off of lmp for how many weeks u r but I ovulate later than most, so wouldn’t that put it off. Ex: I’m suppose to be 6 weeks according to my lmp, but I know I’m 4 weeks from when I actually ovulated. Am I right?? How do the doctors determine weeks??? Help lol