Should I test?

I keep getting random cramps (kind of like my period) that last like 2 or 3 minutes and them I'm fine. But it's not my period. Like it hurts in my lower abdomen/groin area into my lower back... according to this app I'm supposed to start my period the 5th but according to my other tracker I was supposed to start the 1st. I've never had cramps like this. It's been like this for at least a week.

Should I take a pregnancy test just to see?

And whats the best test to take for early results??