I've been using Nuva Ring for about 5 and half months now and I've always remove my ring on sundays of every third week and insert a new one in on the 5th or 6th day of my period.My partner and I have always used condoms during sex to just be on the "safe side" somewhat. My previous period was Mar. 26-29, 2010. It's the end of April 26-30 and my period has not started yet and I took a pregnancy test this morning and it was one solid little pink line (not pregnant) so I'm sitting around wondering what is wrong with my body while trying not to panic or stress my period off. Could the N. Ring cause a missed or delayed period? PLEASE HELP ME OUT.