Help please! Worrying to death! 😭

My last period was September 23rd, which would make me almost 6 weeks. BUT, i ovulated very late last month (October 20/21, confirmed with tests and BBT).. would that make me actually earlier? I had went to the ER for something and they said that my blood HCG was low for what it should be based off my period and they saw nothing on the ultrasound (that includes any signs of miscarriage) .. So does this mean I’m just really early? I get a repeat blood test in a couple days