After Having Uterine Ablation There Has Been No Menstruation What It Could Be?

I'm 50 years of age, I had a Unterine Ablation approx 2 years ago and since have not had a period at all. I also have indication of being in menopause. I'm having symptoms of possible pregnancy and took two home tests which came out negative. My breasts are both tender to slightest touch, slight weight gain (but could be just eating), I did approx 2 to 2.5 months ago had unprotected sex. Is there a reason after an ablation a pregancy test might not read correctly?