Pain med use during period

I don't know how valid this is but I've heard that you should avoid taking pain medication as much as possible for menstrual pain. There was some inconclusive research done stating that pain meds may affect fertility. I used to pop a Motrin every 4-6 hours during my period but have cut back to one pill on day 1 of period only. I try using home remedies instead but sometimes my cramps are too much to tolerate. 
​I was wondering if any of you heard about this pill theory? Do you take pain meds for menstrual pain? If so, which kind? And how much pain is normal?...
I've gotten to a point where every time I get my period I partially blame my use of pain med the previous month... And tell myself I won't take any next time, but that never happens. :-/