When is the right time to take a pregnancy test?

Glow told me AF would come the 26th, AF was late & still didn't come today. It feels like I've been pmsing for the longest time. But I'm kinda worried that i could be pregnant because me & my bf used the withdrawal method twice during ovulation. My period is irregular but I noticed my period always shows up thirteen days after i ovulate & today is the thirteenth day & still no AF. If it comes down to it when should i take a pregnancy test?

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