6DPO - Question

I am currently 6 DPO and am having lower back cramps. I usually get these during my period, so I am nervous. Up until now the only symptoms I’ve had are increased appetite yesterday and cramping.

This is my first month TTC and my cycles are pretty regular. Before I started testing my app said I would start my period this Thur/Fri however I did not ovulate until CD 18/peak on 19, so the app pushed my period back to next week. I am worried this is me about to start my period although I usually don’t cramp this many days before it starts.

Just looking for some insight and words of wisdom! Thank y’all!!!