Loosing weight

Pip • Pregnant with a little boy • c-section is booked for 4th July 2016 at 8am ✨
I'm currently in a size 10-12 clothes. Weighing 10 stone 3. I've put on a bit of weight and feel like I've got excess fat, on my lower tummy and back. Have a wedding in a month and also go on holiday. What can I use to loose weight fast? I can't exercise due to hip problems. Need diet advice and diet tablets etc?