Blood test came back positive. Need advice!!

Hannah
I was told I was pregnant Friday then Tuesday I went to ER bc I was having bad pains they told me I had a MC but no bleeding or anything and I've had 3 MC before so I know how it feels and its awful . but it just doesnt make sense to me! They didn't see anything on ultrasound. Could it of been to early to see anything plus it was on old ultrasound machine..