Missed period by 3days so far

After hasn't yet arrive and I've been having a super dry throat only at night time...I'm not sick or have a cold....just an annoying dry caught and throat at night....Lower back aches nonspotting....and supper suppppper tired every night. I had to force myself up right now 10pm almost 11 bc I haven't eaten...so I ate something small..to get back in bed after brushing teeth and get on glow to see if other girls have had similar symptoms?