Oh lord yes, i've taken it!! I feel for you, because I had wicked side effects the first three months that I took it. I felt more or less insane, couldn't concentrate, got mad very easily, was tired- pretty much my pms worst nightmare. I was on it for an entire year if you can believe that. The first time I took it, they gave me 10mg for 14 days. Again the second month, and then it was dropped to 10mg for 10 days every month after that. It didn't always work. For the year that I took it, I had 6 periods.
I was prescribed the drug to get my periods back to normal (usually had about 2 a year). The first month that I took it, I had an 11 day period. Very heavy! And yes, spotting in between then and the next.
One very weird side effect was that I was in a constant state of desire. Really. It pretty much kicked my hormones into hyper-drive, and even though it didn't work so well for me, it might for you. Good luck!