A question about exercise

So I have been loosely doing LE - no red meat or poultry, some fish once or twice a week maybe, and no breakfast or anything til after 1pm and nothing after 8pm.
February has been my first month and I have lost 12lbs (wahoo!!) but I am now wanting to add exercise, I originally wanted to start with exercise at the same time as starting the diet but just couldn't fit it in so just left it out altogether. We are already TTC so I'm worried adding exercise at this point would sway boyish if we were to conceive this month!?
Thank you :)

I would add it, bc you may not conceive right away and it's an excellent pink sway tactic. As long as you can do it properly, I.e. AT LEAST 60 min 6+ days a week, it should sway pink not blue.

How much more weight to spare?

If you're losing or have lost at least SOME weight on an LE type diet, I'd add it. YOu really can't be adding muscle if you aren't gaining.