No baby on ultrasound

Destiny • Im a 33 year old mom to 2 beautiful kids 16 year old boy & 14 year old girl.....so excited to be expexting another lil blessing with the love of my life!
Yesterday I went to doctors for first visit at 7 wks 6 days, started with stomach one for like a minute saw yolk sac and tech said there's baby looked like a little spec then was off my stomach switched to vaginal and nothing. At first said I could be earlier than what we think had me do blood test and my hcg levels are where they need to be at 8 wks wants me to go in tomorrow for another blood test to make sure levels are rising. Anyone experience this? Any advice? Trying not to freak but hard not to, comment I got from tech was my body is pregnant but baby is not developing and that 2nd blood test will determine what it is! Please help