Advice please.

Ok so I'm tcc but I'm wanting to lose a bit of my belly and get active. I'm 5'7 and at 10.4 stones (144 pounds). Yes I know I'm within my BMI but I'm at the upper half and I feel fat. I also feel unhealthy because the weight is at my midsection. I'm now eating 1300 -1400 calories and walking 10,000 steps daily along with some cardio (cycling) a few times a week and ab exercises. I was wondering is this safe when tcc and also am I able to do the ab exercises? Things like toe touches, crunches, side crunches, planks etc...

please help. I feel maybe I've not gotten pregnant after miscarrying is because I wasn't as healthy as I used to be. Please help.