ok so bear with me while I explain all this. I had an ultrasound 2 weeks ago - according to my LMP I would have been 7 weeks, ultrasound measured me at 6 weeks exactly and saw a heartbeat but too early to hear & measured at 4mm, all good, booked another for 2 weeks later to make sure all is progressing.its 2 weeks later today and I should be 8 weeks based off my last ultrasound, went in, I am now measuring 6w 5d and the heart rate was 90bmp (which tech said was low for 8 weeks, but is it low for 6w5d?)