Should your period always start on the first sugar pill day?

So I started birth control pills 3 months ago. First two months my period started on the first sugar pill day without flaw and I had all the PMS symptoms leading up to it.

This month not so much. Sugar pill day is today but no cramps or normal PMS symptoms besides acne increase.

Glow says I’m not late and should start in 4 days but like I said my sugar pill day is today.

I got pregnant on BC pills once before so I’m not sure if it’s too early to test or if Glow is right.

Thoughts?!

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