Should I take a test?

I had sex December 21st when the app told me it was a 3% chance of pregnancy and it was 2 days after I ovulated that night he came in me about 2 times my period is now 2 days late all I been having is lower stomach pains in my lower stomach should I test or could I just be late? 🤷🏽‍♀️

Update - I just found I was pregnant anddd I’m kinda excited but then again I’m not ready