Hi, I have also had a previous ectopic with no pain, discovered at 6 weeks by ultrasound (requested by me due to previous early loss), so I totally get where you are coming from. Given that your periods are irregular, it might still be okay that nothing has been seen on ultrasound yet. As you probably know, they don't expect to be able to see anything until hcg of about 1500. Given your slow rise, I think you really do need to be vigilant. Perhaps they could do weekly ultrasounds to see whether anything shows up anywhere other than the uterus? I have to say that my current RE told me it took some 10 years (and maybe 40000 pregnancies I think he said) before he could find a case of slow rising hcg that then ended up okay. On the other hand, there are plenty of cases you can read about online where it turns out okay. Hugs and strngth to you, keep your hope and try to be as calm as you can, but just vigilant.