I've been on Yasmin for 4 months. My moods were out of control......

I've been on Yasmin for 4 months. My moods were out of control...more than normal and so my boyfriend and I decided that it was best to stop taking them to see if it was the pills that were causing the problem, so I stopped taking them a week after I started my new pack of pills the first week of Feb. My moods were more under control almost instantly, but the strange thing is that I got my period within a week but it was wasn't when it was supposed to come...it wasn't due for at least a couple more weeks. Since then I haven't had another period, yet I've had all the symptoms of one coming. Mind you, I've had protected sex one time since comng off yasmin and my first period thereafter, but that shouldn't affect anything. Has anyone else had a problem with messed up periods?