There's those easy to heat up food pockets from Pigeon. Can add those to rice. Gerber's used to have small microwable meals but the supermarkets don't seem to carry them anymore.
If that's a step down in any activity you've been doing. Usually you can do anything depending on the fitness level of your body. I continued going to my yoga classes and only switched to prenatal in the last month before I delivered. Keeping your body fit also aids recovery postnatal.