Should I worry or no?

Kasey • 20. Alpha Phi. Radiology/ Surge Tech - saving one life at a time.
I had my period on the 8th of December. My periods are pretty irregular. He came whenever I gave him a blow job then he wiped off afterwards then we had sex. And that was on the 23rd. I was supposed to start on the 4th of this month but I haven't yet. I'm a week late but I don't know if I should test or not worry about it. I've had cramping occasionally but he said he only came the once so I don't know if it's delayed because my periods are irregular and I'm stressing about it too or what the deal is. Any input is appreciated!