mini freak out

Guys I'm posting this cause im in desperate need of some insight...im officially as of 12:00am 4 days late ..I've never been late since my period became regular...literally ever ..sometimes it even starts early ...I have all my usual pms symptoms like I'm gonna start but nothing...like I think my friends are tired of hearing how many times I "think" I've started but turns out to be nothing 
Could I really be pregnant?