Is this another miscarriage??

I had a miscarriage in April this year and am now pregnant again (5 weeks and 5 days according to my <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a>) and I’ve just been for an abdominal scan. The doctor saw the gestational sack - but no embryo in it as of yet. There was also some fluid behind the sack.... is this normal? Am I going to miscarry again? Please advise!!! Thank you xxx