Clomid symptoms

This is my first cycle of clomid. I'm on cd19. I had lots of side effects...headaches, nausea, abdominal pain, light headed, and cramping. My cramping started around cd 12 or 13 and continued until cd17. I had terrible cramping on cd16 which was a day after I got a + opk. Would that mean it's ovulation cramping?? Today (cd19) my breasts started to hurt. I'm not sure if this is a side effect of clomid or if they could be sore already if I was pregnant? Anyone have similar experiences they could share with me? Thanks!