First ultrasound tomorrow!

Heather

Cant wait for tomorrow. About 4 weeks 5 days (or 5 weeks according to my LMP) and getting my first scan. At 4 weeks I had some light brown spotting a light intermittant cramps. My dr wants to check everything is ok, I'm not too worried but excited to see what we can see on the ultrasound. Would we just see a yolk sack at this stage?