im having normal periods ( 3 months now). a week later i have light spotting that last for 3 days, followed my light cramping. I am married and my husband had a vascotmy 4 years ago, we do have open life style , i do have lover. WE do not use condoms , and im noton any bitrthcontrol. I have 3 kids , yet i often cannot get out of bed when i have my "in between"periods. Anyone have any idea why i could be bleeding in between my normal periods?