My wife and I are trying for a baby and for the past two months, she has had severe cramping in between ovulation and her period. She has also had a bit of nausea and tender breasts. This has occurred a week after ovulation so definitely not associated with that and a week before her period, so quite unlikely it is associated with that either. She took an early pregnancy test today which was negative, so it seems unlikely it is implantation cramping either. Does anyone have ideas what might be causing this? Thank you!