Less than 5 weeks pregnant and spotting

Arolynn

I found out I was pregnant this past Monday and on Wednesday I started spotting what looked old blood. Went to the ER and my HCG was 486. Ultrasound didn’t really show anything but Drs think it is because it is really early. I’m less than 5 weeks. No pain no nausea or vomiting. But I notice this when I wipe. Should I be worried