So far it is has been you and your husband for quite some time now. Soon baby will make 3. And that will be amazing, no doubt. However, it will totally change your marriage and relationship, in many good ways, still it will be an adjustment from how things are now. You will not get this time back, the time where you can just sit and talk about your days for hours without interruptions. This time where you can go out on real dates without worrying about a babysitter.
A baby is going to drastically change your life - in all wonderful ways. Still, there will be small things you will miss in your new life after baby from time to time. One of those things will be the time you shared as a couple, just hanging out, taking a drive, getting ice cream, watching a movie, etc. Spend time together now. Enjoy being able to just be together.