I always get my period after 2-3 days when I take my placebo pills but this week I am on day 5 with no period. I am always nervous I will get pregnant even though I take all my pills on time. Is this normal? My period is usually regular

Yes this is very normal. Since the period you get while on birth control isn’t a real period you don’t always get a bleed and birth control is known to lighten or stop the bleed after some time.

If you take your pills correctly then it doesn’t matter whether you bleed or not