No that's cool Emsie - totally understand!
Debtdummy - no need to get rid of gym kit, I carried on going to the gym til I was about 37 weeks! Did need to get kit in a bigger size though!
Seriously though, a bit of gentle exercise is fine, especially after 12 weeks. I used to just walk on the treadmill with a slight incline or go on the x-trainer, I always wore a heart rate monitor to keep my HR below a safe level (140 BPM). You can even use weights, just keep the weights light and don't go on any machines that put pressure on your tummy.
For me, doing abit of exercise made me feel better, have a bit more energy and stop me feeling achey and stiff. Just listen to your body (it's amazing how in tune with your body you get when you're pregnant) to find a level of exertion you're happy with. Obviously check with your dr or mw first. x