Need some reassurance

Michelle

Had our first u/s last week due to brown spotting. We measured 6 weeks 5 days ( 5 days behind from what I was assuming I was at). Just went today for another appointment, a week exactly from the last and now measuring 7 weeks 3 days so 2 days behind. HB was 176. Is this all normal? Just want to make sure since next appointment is not until March 25😭