Might be pregnant

I've been on the progestin only pill (Heather) for about & month In a half. I took a pill over 3 hours late on September 4th and had unprotected sex the same night. (I didn't know I was supposed to use protection) Anyways, my period is due today & so far it hasn't came. Which isn't normal...

I have a regular 28 day cycle & Glow predicts my periods really well & have always been right. Should I test?