Hey Lady help me out

Takila

For theses pass 3 days been having Lower Stomach Cramps on in off Since Wednesday can Anyone tell me what’s going on my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> app said Period was suppose to be on the 13 in today the 14 in still nothing I’m just having lower stomach cramps on in off