please help

ok just found out we are expecting again this will b our 6th bubba. Well for one our families won't approve as they didn't approve of our last bundle of joy 😥 so we have deside we won't be telling anyone until they actually asks but really wanna hide it as much as possible as we dont want drama and stress. problem with that is I look like I'm 6 months preggo lol probably not that bad but yea I'm not actually over weight but i have a little belly from the previous pregnancies that I haven't dealt with what's the best way to tone my belly that's safe in the early stages when i don't usually do much except for walking.