First of all congrats on getting married soon!
As for your weight loss have you tried mixing up your exercise? often your body can get used to the exercise and you won't burn as much if any fat. Maybe try taking a different route (one with a hill or something), on your walk if you come across stairs run up and down them a few times, stop a couple of times and do some star jumps, burpies, mountain climbers etc or even go loner and or do intervals (10minutes walking, 2 minutes jogging - but make sure your walk is as fast as it would be normally)
Personal Trainers or Group Classes may also be helpful to help loose some extra weight you don't want or need.
With your family thinking your getting to thin maybe you need to pop some photo's up so people who don't know you can be the judge and let you know what they think.. You may need to tone more then loose weight.
Good luck and hope you loose those kilo's for your big day