First scan is the worst scan

am

I knew better than to come in as early as they asked me to since now I’m a mess over it! Went in expecting to be 6w1d or 6w2d, based on sex/ovulation (according to LMP 7w3d but my cycles are always long ~36days) Was told I am measuring less than 5weeks, despite seeing a strong heartbeat at 122bpm. I have 2 kids but miscarried 2 years ago and I was measuring 2-3weeks behind with that one so, naturally I’m spiraling. All the positive stories and baby dust for us please.