HELP MEE

Maddison • Mommy of three 💖 expecting baby #4

please read this.

I'm supposed to be 6 weeks and 5 days today. I went to the ER today and got a ultrasound and I'm measuring 3 weeks. My last period was 12/14. I tested on 1/12 and got a clear BFN but got a faint faint BFP on 1/14. I double ovulate, but not sure when. I go Thursday for another ultrasound and blood test because my hcg was 685 today. Has ANYONE had this problem? Could I just be early in my pregnancy?