SCH or Miscarriage? advice?

knottie53227f133dc2240c

Last period began 3/16 I believe I conceived around 4/3. Late at night on 5/1 I started pinkish bleeding (right after sex) 5/2 it was brown/rust & then on 5/3 it turned red with clots. I haven’t had much of any pain just the regular tenderness I have been feeling the entire time. I went to the ER & my HCG was at 874.4 which they said was low but don’t understand how they assume low with no other HCG to compare it to? My OB said the US report saw a gestational sac but they didn’t say much else. The ER dr. Said they couldn’t tell if it was blood or what it was on the US. I’m confused if I’m having a miscarriage or maybe a SCH. I have a history of ovarian cysts & I had them with my 1st pregnancy but I never had bleeding. I’m so worried! Has this happened to anyone? Does this sound like miscarriage or SCH? I’m trying to be hopeful but it’s hard