Anything below 6 weeks will only show a gestational sac. That's what I have on my first ultrasoud. At 6 weeks, there was a fetal pole and a sac with a flickering heartbeat.
How many weeks are you? Its very hard to measure actual day you conceived because of your cycle. I conceived thru intra uterine insemination so we actually know the day I fertilized the egg so I am at the the right week of my pregnancy. They did not count it from my LMP but the day of my IUI which makes sense.
I hope you will see the fetal pole next time.