4 weeks too early to go to ER for bleeding?

Tina
I'm only 4 weeks pregnant but I've been experiencing bright red blood since early this morning. Not enough to fill a pad but it's not super light like implantation either. My husband and I had sex last night so hopefully it's just my cervix that's irritated. Will they do anything at the ER to see if I've had a miscarriage if I'm only 4 weeks pregnant?