Suppose to get my period on Dec.19 and still nothing. I took 2 HPT and negative the only symptom abd cramps.?

Got my period Nov. 19 regular one, I have not recieved one yet this month, the only sympton is abd cramps now and then. I took 2 HPT and they were both negative, I cannot get into the dr's until late, so I decided to ask and see if anybody else has these symptoms and what the outcome was.HHEELLPP