Irregular periods? How to tell if it's "missed"?

Irregular periods. Don't know when it would be considered "missed". I miss them frequently. My last period was Jan 19. I had one before that starting January 5. (Yup two in one month😑) I was hoping to get mirena on Feb 20. But my period has not come. The longest cycle Iv ever had was 52 days long and that was during track and field conditioning. It's been pretty much 1 every 3-5 weeks lately. My boobs normally hurt 2 days before my period and then il get it and they won't hurt. Also I normally get cramps right before(like 2-3 days before). For the past 2 weeks however my breasts have been so sore(tender to the touch) and iv been cramping and snacky and tired. But still no period. My SO had sex with condoms and once on Jan 15 it broke(I took plan b in the morning) and it also broke on Jan 28 and I got Ella 4 days later) im worried tho. Is it possible that I could be pregnant?

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