My best friend was in a similar situation.
Cramping, bleeding before she was expecting AF. No AF.
BFP.
Red bleeding.
HCG #1 -61
48 hours later, 91.
Apparently some womens' levels increase by as low as 53%, and that was exactly her increase. Still, she had little hope.
48 hours after her 91, she had a reading of 213! It just needed to catch up!
Definitely do not go by one reading! Sometimes, don't go by two readings!
I really don't understand why people in the medical profession make comments like that to make us even more nervous!