Hi Candice,
When I get a yeast infection I have to use strong meds to get rid of it especially if I am still on iv's at the time.
I use the seven day cream (monistat) and use two pills also.
If I dont do all that then it does not go away or if it does it comes back after the treatment.
Having said that, it can be possible to have a bacterial infection and not a yeast infection. The symptoms can be very similiar. Not knowing what your symptoms are I cant be of much help. Just thought I would give my opinions.
HTH!
oh and by the way either of those infections should not delay your period. It might just be the change of b/c's, or with some women a yeast infection is a sign of pregnancy.