I'm glad to hear you are married for your own protection. That gives you LEGAL rights you just don't have if you aren't married and something happens. Military wives are much better taken care of than military 'baby mammas'.
Find out what support services are available for spouses of deployed soldiers. I'm sure someone in his chain of command can help you with that, whether he is reserves or active duty.
You may have already done all this, but don't lose sight of the pratical preparations you have to make in the middle of all the emotional turmoil!
From a pratical stand, make sure you have his paycheck deposited in a joint account so you have access to the funds, etc. Be sure you are listed on any life insurance policies and as next of kin in his military records. I know you don't want to think about that part of it, but it's important to be prepared, even if the 'worst' is unlikely to happen.
At any rate, it sounds also like you are concerned about your own father. I hope you can lean on Josh's family during this time and not your own, if you are fearing for your own safety around your family.
It's time now to grow up quickly and be able to take care of yourself and your baby while Josh is away.
I know it must be overwhelming at this time, but if you can pull yourself together and make smart preparations, you will serve yourself in good stead for not only this temporary separations but for ther rest of your lives together!
I hope everything goes just fine for you - please keep us posted and THANK YOU and Josh for making these sacrifices for us ALL!
God bless you and keep all three of you during this time!