Should I take a test?

So I had sex april 7 and I took a plan b April 10 to be safe since i think he came inside me a little. I’m on the pill but I haven’t been super good at it recently but I took 2 that day (april 7) and I took 2 the next day since I had missed 2 days so I was back on track. My period is supposed to start on the 19th according to eve but I’m already 4 days into placebo week and I usually start my period 2 days into placebo week. Should I take a test or should I wait?