Ovulating twice??

As

Can you ovulate twice in one month? I know for a fact I ovulated in June 3rd because I used an opk and it came back positive on 2 different tests. Well today and yesterday my stomach has been cramping like crazy and my boobs have been hurting like HELL. When I start my period I always know because my lower back hurts and my stomach cramps but my boobs never hurt. Finally I took an opk just to see and it showed that I was near ovulation again. WTF???