Please!!Help!!! How can I misscarry if my Uterus is "Empty"??

Allie💕 • Open to new friends while returning support. I have one Daughter💝and two Angel Babies💕With my Rainbow Boy on Board💙I hope we all have a smooth recovery with PLENTY of Baby Dust✨
Please help me understand and have some type of xlie to what is going on.. My follow up appointment isn't until Oct5th.. Thats a LONG time to go without answers.. I just found out I was pregnant a week ago then two days ago I went to the E.R due to cramping in an overall uneasy feeling about how light my test lines kept coming back yet my nurse saying I should be 6weeks.. The worse news was confirmed... I have the pregnancy hormone in my blood but it was only 48.. The couldn't see anything in neither of the Us.. I never bleed or had cramps before just a normal pregnancy test then very faint ones days later.. When did I lose my baby2be?? Why am I cramping and bleeding now if my Uterus was "empty" I'm just can't figure this out.. And my heart hurts to much to keep killing myself with all these unanswered questions.. My nurse said everything will be answered at my follow-up.. I sorry but WTH am I suppose to do until then!?!? PLEASE!! Any comments or possible answers would be great!! Just anything to help me figure this out!! ALL I knw is one minute I was pregnant then the next I wasn't!!😭💔😢💔💔