How long did you start feeling your belly go down ?

I’ve been on Sema for 10 weeks now I’ve lost 14 lbs but I still haven’t seen much in my belly’s area? I workout by going for a 5 mile walk daily so 10k steps a day but I split them into 2 I walk 5k steps in the mornings and 5k in the afternoons and ugh just feels frustrating 😑 from time to time I do sit ups but just depends since I have a bad back