Pregnancy signs or what?

I'm trying to conceive pero irregular yung menstruation ko like mag-skip ng 1 month. I had my menstruation last December 16, 2020 (first day). 2nd week of January I experienced some abdominal pain and hyperacidity only at night. 3rd week of January until now is breast pain. Pero negative po yung PT. Ano po kaya ito? Sino po sa inyo naka experience ng ganito? #advicepls