Hi, I Am 51 Yrs Of Age. My Last Period

Hi, I am 51 yrs of age. My last period was on the 1st of august 2015. I have a regular menstruation but I missed the month of September and then had my period and lasted for 2 days only and now just seeing pink color stain. I had been sleeping with my boyfriend on and off. I have felt all the pregnancy symptoms and I am just wondering if it's menopause that I am going through or pregnancy?