If bh are 5 minutes apart should I be concerned? At 37 weeks?

Yes. Typically we say if contractions are 5 minutes apart then that is a good time to come in to labor ; delivery.
Any concerns at this. Point in your pregnancy should be directed to your OB doc first do not know what bh means but i assume you are talking about contractions, so if you think you are going into labor which can easily happen at 37 weeks please call your OB doc now.