could i have had a miscarriage?

Last month I missed my.period which is normal for me due.to a hormonal imbalance. But the past week I have swollen tender breasts and severe cramping and back pain to the point I.just could not move. Yesterday morning I woke up to cramps that were so tight and uncomfortable and.noticed I had brown chunky discharge. And an hour later it turned into thick dark red gooey stringy blood and about 2 hours later it all magically stopped. My back was as good ad new and my breasts are not as tender. Could I have had.a miscarriage?