Miscarriage ?

I’m found out I was pregnant and the hospital said I had to at least be 4-6 weeks.

Went to a clinic they said I had to be at least 4 weeks from there calculations, they did a screening and didnt see anything at all.

The lady said I’m either having a miscarriage, it’s in my Fallopian tube, or I’m earlier than expected— and to come back next week.

I looked it up and it says hcg rise quickly in the first trimester and hcg is a hormone made by a placenta.

And I remember takin 2 plan bs this month like 2 weeks apart bc I had a scared. Could that plan happen to idk kill the “forming baby”

Am I really pregnant?