Advise exercising, yoga & dieting

Lo0n3y

Hi was looking some advise started dieting and sticking to 1400 calories have been doing this for 2-4 weeks and haven't lost anything buy faith. I was in a car accident so couldn't exercise but physio have got me movement and suggested I start yoga, Pilates etc I started the gym for the past week I go and do the cross trainer, tread mill walking and the bike as I can't lift weights as ive no power on the left side, will doing Pilates, yoga and this cardio help me to lose lbs or am I wasting my time?
My diet is under control ur I don't know what I'm doing wrong,

Thanks