Pregnancy signs or hormone changes

Last AF came on time but was not my normal.. next AF date was for 4/28 but came on 5/1 and now I'm spotting ready to say good bye AF. But for 3 weeks I had sore breast, burn sensation in breast, very bad heartburn along with hot flashes badly. And stomach was feeling heavy.. I'm usually have AF visits for 7-8 days.. can this still be pregnancy signs??