Is it normal to bleed in early pregnancy?

I am currently 6 weeks pregnant, I have had very light bleeding which I have been referred to Early Pregnancy Assessment Service for.
During this appointment I had a transvaginal scan done which I was told, sac was empty and no baby seen…
Doctors are not giving me many answers apart from it can be normal/ sometimes it isn’t… :frowning:
Any lovely ladies that have had personal experiences with something like this? Please help in sharing your experiences and what was the outcome…
any information is much appreciated :heavy_heart_exclamation:
Thankyou so much lovely ladies​:heavy_heart_exclamation::heart: