I have been on a very low dose of Lisinopril for about a month no...

I have been on a very low dose of Lisinopril for about a month now in treatment of Proteinuria in my kidney and have not experienced any of the known side effects. I am, however, experiencing a very erratic menstrual cycle, namely spotting virtually every day. I have been to see an OB/GYN and it has been determined that my internal organs are normal. I do not believe that I am premenopausal and hormonal tests have confirmed that. I have read in this discussion string that a someone else has experienced similar symptoms. Are there any more women, who have experienced this problem? I may just go off the medication to test this theory.