Do I have to worry if I don't have bleeding after a 3 tablet of placebo?

Good morning, I didn't get withdrawal bleeding on day 3 of the placebo pills, and only once since April has it happened that I got it on Thursday morning. Today the fourth day, I was in the toilet and still nothing. I take the tablets regularly, nothing reduces their effectiveness. in the break before the current packaging there was one intercourse without additional protection (and be ejaculation), and the rest additionally with a condom. do I have to worry? because that's what I do, usually I get 3 days in the afternoon