Heartbeat before 6 weeks?

Hey ladies. I just had a transvaginal US and my sonographer said my pregnancy looks to be 5weeks2days but im wondering if I might actually be 6weeks2days as I saw gestational sac, yolk sac, embryo and we saw the heartbeat. I'm just unsure as I've seen so many people on here saying that they had US before 6 weeks and didn't see baby or heartbeat, just the sac at that stage. Would I be right to think I'm maybe 6weeks2days instead since we saw all of that?