Need other opinions

Kasey • 20. Alpha Phi. Radiology/ Surge Tech - saving one life at a time.
I had my period on the 8th of December. I had sex on the 23rd. I was supposed to start on the 4th of January but I haven't started yet. My periods have been irregular for a little while but I just need other people's opinions of whether I should test now or wait a little bit??