I've worked with spray paints my entire pregnancy, just don't breath in the fumes and you should be fine
There are paints that are perfectly safe for you and your baby, have a zero VOC and are non-carcinogenic. Here's an article that might help as you're doing your nursery. Have fun with it! http://www.saigenicoles.com/blog/baby-room-design-101-5-design-tips-for-creating-the-nursery-room-of-your-dreams.html