Am I pregnant or another symptom?

Patient: I got married in August 2014. Normally my periods are not regular, I had periods in Sptember 25th and again on December 1st. Now my stomach is getting bigger and I did 5 home pregnancy tests, all become negative. Then I took Primolut N for three days. Still I didn’t get periods, Am I pregnant or any other symptom? Do I need to consult a gynecologist?

Symptoms: Stomach is getting bigger, not getting menses