25lb weight limit at 14 weeks

Is that normal?
I've had 2 miscarriages and I work in a grooming salon. 
My weight is normal to my height and I'm not sick, I just have daily headaches and a hard time sleeping. 
But, she told me to take Benadryl for sleeping and that fixed both those problems, so back to the question. 
Should I be concerned with the weight limit being so low so early?