I think i'm 4 weeks pregnant and my dr called me today and said my levels were 300 and that 300 at 4 weeks means this is a bad pregnancy. is he right?

Re check HCG levels: A 2nd HCG blood level should be used to compare the new value to the old one to determine whether or not this pregnancy is progressing satisfactorily or not. A single HCG value can be erroneous. HCG levels generally double every 2 to 3 days in viable intra uterine pregnancies. Low values can also indicate a pregnancy outside of the uterus (ectopic) which can be dangerous to your health.