Hmmm, I have been given it for the exact same reason, to try and regulate my cycle, but that was down in Oxfordshire by my old GP! My new one however said its completely pointless because when you come off it you always have a withdrawal bleed so just takes it back to square one, plus if you were to fall pregnant whilst taking it then its not recommended in pregnancy and you would be taking it for at least two weeks before you even knew you were pregnant if you get what I mean.
I don't know personally I would get a 2nd opinion, but at the same time I don't want to make you feel horrible xx