Hello,
It's hard to say if they will see anything or not. I know women that have had a scan at 5 weeks and nothing's been seen and then a week and half later they've seen a fetal pole with a heartbeat.
Personally, I had a scan at a fertility appointment earlier this month to see if there was anything abnormal with my uterus and there was a 5 week pregnancy there. We saw in effect, the sac and yolk, but to me it was just a bright circle. I had a follow up scan almost 2 weeks later and saw the fetal pole with the heartbeat etc.
Just go in with an open mind, just because you don't see anything doesn't mean bad news at all. Hopefully you'll see a sac and yolk xxx
P.S: I've had spotting and cramping too and as of now am still pregnant, so there is hope x