unusually heavy period

My period is typically characterized by a very light flow with heavy cramps in my back, however this month I've had pretty light cramps and a really heavy flow (by my standard). 
It's not bleeding through a maxipad every hour kind of heavy but it's enough to make me notice this isn't my usual flow. 
Is it normal for your flow to shift like this? I'm not on any medication but I had been taking pain killers pretty consistently earlier in the week for a dry socket from my wisdom tooth extraction. Maybe that thinned up my blood? 
Thank you for any answers ☺️🙌🏻