Maybe pregnancy symptom or just period is coming

All day today I have been eating non stop pretty much which is totally weird.. and last week I was having cramp like pains and I been tired lately and sleeping during the day and very moody. And it been off birth control for at least almost 2 months now and having u protected sex.. but my period is supposed to start next friday.. is this just symptoms of period or pregnancy. Oh and I been having a lot of acid reflux lately and also constipation.. please help.