I had an ultrasound done i'm 5weeks3 days and they said they only saw asac no embryo what does this mean will the embryo start togrow soon i'm worried?

Just repeat the scan: Once your betaHCG level passes 1000 to 1500 mIU/ml, a small seemingly empty gestational sac is the first transvaginal-sonographic finding of a very early pregnancy. The presence of a secondary yolk sac then of a small embryo will soon follow and can be correlated to the levels of betaHCG and to the overall dimensions of the gestational sac. A well timed repeat sonogram will answer your question.