I'm so sorry
The medicine is methotrexate. Wait and see what tomorrow brings. I'm guessing they may not be able to see anything tomorrow with such a low beta. I understand not wanting to terminate the pregnancy, and you should have a little more time to wait. But, some pregnancies don't easily m/c naturally even when they are not viable (like blighted ovum, missed m/c, molar pregnancy) and if you don't accept medical intervention it can be dangerous to you. I would guess you aren't quite there yet, but just follow your doctor's lead and trust your instincts.