Why the ER during a MC?

Kendra β€’ 3 m/c and 4 years ttc before 🌈🌈🌈 who is now just over a year old! Just found out I was pregnant with #2 and am due 03/2019!!!
Hi all! I have seen a lot of women on here who are going through a miscarriage when only 5, 6 or 7 weeks pregnant and I was just curious as to why? I had a miscarriage around 5 weeks but the OB said there was nothing they could do about it and that they would just check things out when it was done to make sure everything passed through. And ad far as I know, there is absolutely nothing the ER could do for you if you are in such early stages of pregnancy. Anyways, I'm not bashing anyone or anything like that, I just truly want to know what the ER could do to help. Thanks in advance for your responses!