I am sorry for your loss.
I am so sorry to hear about these recent events, Claudia.
The loss of a pregnancy is devastating, but please understand that you are not at fault and miscarriages are unfortunately relatively common within the first trimester.
The most important steps going forward is following the plan your ER set up for you (getting an ultrasound and another beta). At this point, it is useful to keep an eye on how much blood you're losing. You may be referred to an early pregnancy clinic, where a nurse/OBGYN will be able to help you going forward.
Again, I am very sorry that this has happened to you and I wish you the best of luck going forward.
I'm so sorry to hear!! Thank you for sharing.