Placebo pill and periods

Is it normal for your cycle to change a little the longer you’re on the pill?

I’m on my third month of the combo pill. I take them at the exact same time at 10pm every night.

The first month, my period started on day 4 of the placebo pills, the second month my period started on day 3 of the placebo pills, this month I just took my first placebo pill last night, less than 24 hours ago, and I’m already noticing pink discharge!

Is this normal?

I should mention that I did start my placebo pills 3 days early as I have an event next week where I’m wearing white and would like my period to be over early.

Did my period start less than 24 hours after the first placebo pill because I took it early, or just my body still adjusting to them?