Answer and i will answer yours...?

OK so today is my friends birthday and I really want to call her to tell her happy birthday but the thing is that at the moment things are awkward between us because I confessed that I began to develop feelings for but turns out she has a bf I knew Nothing about and we tell each other everything. So I'm wondering if it would be appropriate to call and wish her a Happy birthday even after her turning me down plus I'm also afraid that things might get awkward or ill just be at a loss of words.help need serious advice please.