It affected me too - every two to three weeks to start with. I tried BCP but that didn't help at all and I went off it. I think in time it is getting back to something more regular, but that's been nearly 9 months. I know when we lose fat we release estrogen which certainly can cause a problem. I would give it several more months before you worry about it. I also think in my case (in my 40s) age has a lot to do with it.

Squid