miscarriage

so I've been thinking, a little over a month ago, my boyfriend and I were having sex and the condom broke. He caught it in time, but there is always that slight chance, especially since it was the peak of my fertile window. later on in May (near the end) my period was a few days late and my cramps were never like they had been. it was constant pain. I also had headaches and lower back pains. I was looking up what a Misscarriage vs. Period was like, and they say Miscarriage can have worse cramps and back pain and things like that. 
so I was wondering if anything like this has happened to anyone? and should I tell my boyfriend it could have possibly been a miscarriage?