I am so sorry to hear about the deployment. My husband is probably going again in August. The first time around, I was pregnant too. To be blunt, it sucked to be a working mom, now single for all intents and purposes, with a 2 1/2 year old daughter, and pregnant all at the same time. First, I spoke with my doctor about scheduling the birth a week earlier than my due date. She was happy to cooperate with that, and my husband was able to schedule leave to come home at that time. Now, your husband will only have been there for a couple of months, but his commander might be able to do something to help on that front.
On my husband's first deployment, I was relatively new to the area and didn't really know my neighbors. I ended up hiding that he was gone because I was alone with a small child and pregnant on top of it. I didn't want anyone to take advantage of that situation. It was wintertime, and the neighbors didn't end up finding out that he was even gone for 3 1/2 months. This time, my neighbors know what is coming, and I can't tell you how grateful I am for their support. They have universally offered their help with babysitting, the house, etc. -- as have my husband's coworkers (he is a teacher, and works mainly with women who are very concerned about him/us).
So, my bottom line is that it is going to suck. However, it doesn't have to be as bad as it seems right now. Try to get to know your neighbors. Ask for their help -- they will want to give it. Also, talk with your husband about him calling his parents -- for him to ask for them to be more involved and to help you. You are going to need it. Call the local VFW. I continually see info from our local post that they have guys in the area who will do stuff for you for free -- mow the lawn, plow the snow, household repairs, whatever. They want to help too. They have been there before, and they know how it feels.
Another thing to consider if you can afford it and you won't get fired for it -- you might want to talk with your boss about going part-time until the deployment is done. I ended up doing that last time, and it was worth the cut in pay to have a little bit more sanity and time in which I could feel like I was spending time with my kids and I was able to get some things done instead of just on the weekends.
Finally, let people know the situation -- your church, your friends, your neighbors, your family. They will offer to help. They will, and they will mean it (even the ones in Florida to whatever degree they can do so). When they offer, say yes! And don't be afraid to ask for help. I am always concerned that I am bothering people, but I can tell you that they WANT to help. They do. Right now, my husband is leaving for many long weekends to train for his deployment. I teach an early-morning class on Mondays, and have to leave the house on Mondays at 6a.m. Now, who am I going to get to watch my kids and transport them to school from 6-9a.m.? My family is not close by either. Well, I am going to have to break down and start calling some of the retired ladies from church to see if they can help me. And you know, they will if they can at do it. If they can't, I am going to have to call some friends who I don't want to call because they have small kids too, and they are going to be busy in the mornings. But you know, I am going to have to get past being worried that I am bothering people. If they can at all do it, they will help me. They will help you too.
One last thing -- have a good sounding board person on speed dial. When I was by myself and incredibly frustrated with my older daughter's 3year-old antics and my baby's desire to not sleep unless I was holding her, I would pick up the phone and call my friends in Michigan. They would "talk me off of the ledge" and give me practical advice on how to deal with the situation. They would also let me know that I wasn't crazy and that I was a good mom. It was so helpful and valuable.
Good luck, L.. If you need anything, let me know. I am happy to help if I can. And I really mean it.