Irregular period after regular periods for over 5 years

I have been on the pill since 2016. With the pill, my periods typically last 4-6 days, are super light (like nothing even on my pads), and I'll have very mild cramps for maybe a couple hours the day before it starts. This is pretty much how it has been since I started the pill, with the exception of a month or two here and there where I got really off-rhythm with taking the pill. The last time that happened was maybe 2 or even 3 years ago.

This month, however, it came a week early. I am currently on day 11. It is much heavier than normal, and I have had some mild to moderate cramping pretty much every single day. The last two months I have been on top of taking my pills, never missing a day and always taking it within my usual window. My boyfriend always use a condom on top of me being on the pill. Any clues as to what is going on? Am I being stupid for not going to my doctor?