Im 6 month postpartum via csection no period as of yet. several neg. pregnancy test. bottle feeding. should i be concerned that something isn't right?

Not yet: It can take several months for periods to resume after delivery. Just remember you can get pregnant before having a period. Take care.

Yes: U need a workup, should be having periods, can be many different reasons, please see your obgyn for evaluation.

See your doc: If you never breastfed i would definitely check with your doc... If you stopped recently you could expect it within a few months.