Any words of encouragement?

Today is supposed to be start date of period but I got BFP..BUT. I had 2 chemicals in the past so my dr had me get my levels drawn Monday (which were 27) and again today (34) but said that was not an adequate rise. Like what does that mean? I’m Going to miscarry? They want me to go back again to have re drawn Friday..my number went up and it’s still super early so should it be doubling at this point? Any and all advise welcome..thanks.