Definitely paint your room (good excesize) but be careful by putting hands up (not good for pregnancy). Top of the room can be painted by your friends. Instead of paint you can use lime as a paint adding a little colour. Our grandparents used it and it acted as a desinfectant. I did the same during pregnancy. Eat also plenty of vegies/fruits and also take multivitamin/minerals supplements (our vegies are not groving on perfect soil!). Have a healthy baby!