I'm kind of worried. As of LMP I and 4 wk 3 days. My hcg levels are doubling but what I'm wondering is why are they so low and why can't we see anything on ultrasound? I've had 3 ectopic pregnancies all on the right side. Third one resulted in loss of right tube. My left was scared down now it is free and obviously works Lol. Just wondering if I should be concerned cuz of hcg levels and nothing on ultrasound? Any and all answers are greatly appreciated.