Feeling like my period is coming

FTM. I’m 33wand4days and this morning when I woke up felt weird.. I couldn’t put my finger on it.. after a couple hours I know that I started feeling as if my period was about to come on.. I was a little cramping a little and my back was hurting too. Well I went to the flea market today and I was still feeling that way.. after that we went to the lake and I felt fine.. now its 12am and I’m starting to feel like it again.. and normally if I was on my period I would push just to make that feeling to go away. Is this normal.should I be worried