Can we file for a dependent visa when H1B is being processed?

Hi All,

My Employer is filing my H1B now for 2014. I am submitting my documents for the same. My finacee is in US. I am going to get married in May. Can I apply for Dependent Visa after May while my H1B is being processed?

My doubt is can two visas be processed at the same time.

Thanks in advance.