should i be worried? HELP!

So i got my LMP June 14th and took a pregnancy test July 14th and got a faint positive. my cycle typically runs 27-30 days. I got my blood work and my hcg level is 147 and progesterone level is 15. I suffered a m/c last July and had low hcg but also lower progesterone. my Dr just called and said she wants to set up my ultrasound apt for when I am 8 weeks (Aug 9th). she said she is not concerned with my levels and does noy want to recheck as I am just early and my progesterone is good. same Dr as last time but last time after first blood draw was lower (160) she sent me for a second a week later as well as a progesterone. is she not sending me for a second draw because she did the progesterone this time as well? super nervous. dont know what to think. I have two healthy children and only one m/c.