As your abdomen expands, your sitting position needs to be monitored and adjusted to ensure you are maintaining the best sitting posture possible.
This ensures you are not over reaching for extended periods of time which puts additional strain on your body.
Adjust your seat so that is tilted downwards slightly to ensure your knees are lower than your hips to aid blood flow.
You should also make sure there is a gap between the edge of your seat and the backs of your knees.
The back support should be tilted slightly backwards to relieve pressure under the bump whilst you maintain contact with your back rest.
Take regular breaks from computer work and make a point of getting up and stretching every 20 minutes. Never work through discomfort, listen to your body and take a break even if only for a minute or so.