Plan b and delayed period

Hi! So I’m really stressing out right now and I’m looking for some advice. I had unprotected sex the day after my period ended on May 3 and took plan b within the first 12 hours. My period was due on the May 28 and I still haven’t gotten it. I know it can delay your period a while but I haven’t had any spotting or anything, just some cramping and an upset stomach. Should I take a test?