Looking for a little hope... Based on my last cycle I'm 8w 0d but I had an early scan last Wednesday…

Looking for a little hope... Based on my last cycle I'm 8w 0d but I had an early scan last Wednesday and I measured 5-6 weeks. All that was visible on the ultrasound was the gestational sac, yolk sac and amniotic sac. I've had light spotting since for 2 weeks but they say it's a side effect of the progesterone supplements. Anyone else having issues similar?? I'm hopeful and prayerful but I can't help but worry.