What should I do if my period is delayed?

Good morning
I took the contraceptive pill orlifique for two years. I stopped taking them 2 months ago, after stopping the pills I got my period. Now there should be another one, and there isn't. I would like to add that I took a pregnancy test, it came out negative. My partner and I use condoms, but I checked it just in case. I'm very anxious or is it normal that my period doesn't appear? Should I see a doctor? Today is the 31st day of my cycle, the previous period I got on the 28th day.