Use Pulsatilla to regulate your cycle? It's very generalized.
REad this HUGE lists of symptoms pulsatilla can be given for. http://www.minutus.org/pulsatilla.htm
Yuo can't certainly say it is used to regulate your cycle. HOmeopathy is very individual and what might fit into someone's picture may not fit into yours. Two people with the same disease will be most likely given very different remedy.
Ask your homeopath what would be the best remedy to regulate your cycle. Sepia comes to my mind, but again, may not be the one for you.