Agree with what's Karen has said, also not midwifery trained but I would also think to whether any qualification you earn in the US would be recognised here in the UK. to be a midwife in the UK involves either a 18 month or 3 yr course. (18 months is for already qualified RGN's)
Quoted on NMC
'the standard of training for midwives is common throughout the EU and must be at least 3 yrs long as an initial registration (at least 156 weeks full time) or 18 months if undertaken following registration as a general nurse in the UK.
to be registered as a midwife in the UK you must be able to demonstrate:
Qualification and registration (if applicable) in your own country and that you wish to practice as a midwife in the UK.
That the training undertaken was specific to the role of midwife, enabling you to meet the unique requirements of midwifery practice.
that the ratio of the therory/practice componment in the training programme was 50:50
at least 12 months post qualification experience as a midwife within the last 5 yrs.
It does mention a few more requirements and how to register on this link
Hope this helps