Question... 🤔

So my last period was (I believe) March 10th. My periods aren't always on point and so it's a little harder to always remember.. anyways.. so a few days ago I took a test and it came back positive. I went to the hospital with some pelvic pressure and I was told it was bc I'm pregnant (they did another test) and bc I have a uti. I went to my OB two days ago and they again, tested me and set me up for an appointment with the ultrasound tech (today). I was told I was about 5 weeks 4 days when I saw my OB. But today at the ultrasound the tech said she thinks I'm earlier than that bc we couldn't see anything.. literally nothing was in my uterus. She said maybe in 2 more weeks there will be something there. Has this happened to anyone before? I'm so confused. All I want is answers and a due date! Someone pleaseee lmk if they've gone through this ❤