Have you explored the SparkTeams yet? I'm sure there are groups for people who are parents or expecting or still at the conception stage. You should take a look, I'm sure it would be helpful to find people who are or have been in the same situation you are!
Also, finding someone locally that you can use as a motivation buddy (whether it's your husband or a friend who also wants to lose weight) can also help a lot. You can plan walking dates and make healthy meals together. Seriously, as awesome as this site is, having a workout buddy has been the biggest factor in my success in getting in shape. Sometimes you're just not feeling motivated to do it for you and it helps to feel obligated for someone else!
Remember that this is a life change, not just a temporary fix...and those can take time. Have a goal to lose 2lbs a week but don't be disappointed if you lose 1lb a week. Whatever your goal day is for losing 20lbs, give yourself a few extra weeks beyond that date to actually get there. Hormones, water retention caused by lots of different factors (exercise, high salt foods, hormones), and life stresses can slow down your progress. Don't let it throw you off track! If you "mess up" and eat more than you planned to at a given meal or during a given day forgive yourself and start fresh at the very next meal, don't stress over it or feel like you have to punish yourself by skipping a meal or exercising harder, just go back to your healthy routine and remember that you're in this for life, not just a quick result.