Hi katylou and welcome to the forum. Congratulations on your news!
I have a client in exactly the same situation as you at present, and we are in the process of varying the terms of her IVA to allow for a six-month payment break. The missed payments will be made up by extending the IVA at the end.
If you find that you are not going to be able to make the ongoing IVA payments until you return to work, then you must discuss this with you IP at an early stage to see what they suggest.
Alternatively, if it is no longer feasible for you to continue with the IVA, then you may wish to consider bankruptcy proceedings or a reduced payment Debt Management Plan for the future.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk