If she was
pregnant, it would have shown on the
pregnancy test. But it is better to re do the test in a certified lab using early morning urine
Married since April 2016, you have completed one year and more after marriage. If you wish to have a pregnancy, get properly treated. I hope you have consulted your Gynecologist for the 2 m absence of period.
Next Steps
Irregular period means your wife appears to be having hormonal imbalance which makes the ovum release erratic. You need change of medicines to make it happen regularly. So either report to your gynecologist about it or change the gynecologist