So I'm pregnant how come they couldn't find anything?

On Monday I just found out and thought I was having an irregular period cause I was bleeding but turned out I'm pregnant. I went to the er and they said my hormones were under 2000 so they couldn't see anything yet the bleeding finally stopped they wanted to make sure it's not a tubal or miscarriage is it becuase it's too early? I'm just asking please don't be rude this is my first time getting pregnant I don't have much experience