Has it happened to you?

So about a week ago almost two weeks ago I had some heavier bleeding and decided to head over to the emergency room. Well I went in thinking I was 5-6 weeks pregnant based on my lmp. They did a pelvic exam and said cervix was completely closed and it was just old blood. They did a transvaginal ultrasound and said they seen the sac and I was only 4 weeks. I just want to know if this has happened to anyone else and everything still be okay? Please no hate, I'm a first time mom so of course I'm curious. They didn't seem too concerned about it so I didn't want to go straight to freaking out. I don't have an appointment until next week. I haven't had any further bleeding just some very mild harsh cramps which I was told is normal in early pregnancy