ease my mind? measuring small

savannah

So I ended up in the ER last night because of a fever spike (turns out I have the flu). But while I was there, they did an ultrasound. based on my LMP i was supposed to be 7 weeks 5 days. but the baby was measuring 6 weeks 6 days. heart rate was 148 bpm. is this normal? has anyone measured this far behind and had a healthy pregnancy? thanks in advance y'all