Insomnia

Anna
Hi everyone!
Generally speaking, I fall asleep on the couch by 10pm at the latest.  However, this past week I've been up until midnight, 1, 2..etc. OR I've been able to fall asleep at 11 but then I'm up by 2 or 3 staring at the ceiling for a long time.  I've never really had insomnia and I'm usually a good sleeper.
Any thoughts?
According to my tracker, my period is supposed to start today.  If it doesn't come today, is there any chance this could be an early pregnancy sign?  I just don't have any other symptoms so I don't know if I can take fatigue/insomnia as an early pregnancy sign or not.  
Just wanted to see if anyone else experienced this!!