Anyone on day 51 of no period.... Took 6 tests and all were negative and went and had blood and urine tests done and were negative but you were indeed pregnant?

Im on on day 51 i have a dr apt Wednesday will prob do urine and bloodtest and im scared to find out the results but if there negative how can they find out y i have not started....

My last cycle was dec 10 thru the 16 and is usually 35 days... I stopped bc oct 1 and was regular until now...

Sincerely, lost and confused wife