Omg I’m super confused

I went in around 4 weeks w bright red bleeding and they tested my hsg was high testes it a second time and it was going up they gave me a ultrasound and confirmed a super small scan in my uterus they said it’s not an ectopic so I go back tomorrow!? The doctors don’t know what it is do you guys believe it’s a SCH orrr threaten MC AND have u went through this w a SCH