Doctor wants bloodwork before seeing me

I realize I’m so early at 4 weeks 4 days but my doctor wants me to go for bloods every 2 days starting tomorrow. I won’t even see the doctor until after 3 blood draws. Why can’t I just wait until I’m far enough they can see a fetus? Last time I just went for exam and ultrasound because I was 7 weeks. I’m not complaining about checking but if I’m not pregnant by 7 weeks then what’s the point of bloods done at 5? Or why not just schedule a “7 week” exam?