What to do if you forget a birth control pill

Hi, I take Levobel 0.10mg / 0.02mg. On Saturday I had the 3rd pill of the 3rd week and I dropped it, and because I couldn’t find it, instead of taking it at 2 pm, I waited to buy another box and took it around 6 pm. at the same time, coincidence that today Monday, when going to take the pill I have realized that I did not take the one on Sunday (4th of week 3), and looking at the leaflet I have followed the instructions and I have taken the one for today Monday and Sunday’s at the same time.

Am I protected against pregnancy or should I use a condom please?

also I have the doubt that the leaflet indicates: “forgetting a tablet between days 15-21 (3rd row)
-Take the tablet as soon as you remember, even if this means you have to take two tablets at the same time. Keep taking the tablets at the usual time. Instead of starting the placebo week, throw them away and start taking the next pack (the day you used to start the bottles, it will change) “

I do not understand this, because today I have taken the 4 and 5 of the 3 week and on Wednesday I will finish the 3rd row as always, so if I pass the placebo, I start the new container on Thursday as always, so I don’t know what refers to what the day will change.

Thanks in advance